this is what i call real learning. You demonstrated total internal reflection very well.

@Angel_queen470

5 жыл бұрын

And I thought dispersion was possible through prism only

@fikru3759

3 жыл бұрын

At 54 dispersion

@mahak2863

3 жыл бұрын

Sooo turu👍🏻

@ishworshrestha3559

3 жыл бұрын

Yes

@nyaydishgadi4687

3 жыл бұрын

Without speaking a single word!!!!!!!

As a physics tutor, I've found this video to be very useful. Many professors do not perform an in class demonstration of critical angles, leading many students to not understand critical angles and think of it as an abstract topic. Showing them video has contiually been the easiest way to help them understand. Thank you for a simple video

@wellrose17

4 жыл бұрын

Is there anyway you can describe what's happening & how it is used w/o putting yourself out? If not thanks. I'm fascinated by light, physics & geometry. I lack the education though.

@blueeye2281

3 жыл бұрын

Finally a teacher that wants the students to understand!

@shrishtisingh9360

3 жыл бұрын

@@wellrose17 in this video, total internal refraction of light is being demonstrated. When light enters from optically rarer medium (air) to optically denser medium (glass slab) it bends towards the normal. When light travels from optically denser medium ( glass slab) to a optically rarer medium (air) it bends away from the normal. This case is required in TIR. When the angle between the incident ray and the normal becomes greater than the critical angle, TIR occurs. What is critical angle? Critical angle is the angle where the refractive angle becomes 90°, which means that when light is refracted going from denser to rarer medium, it's seen as grazing emergence ( refracted ray passes through the normal )

@Blade.5786

3 жыл бұрын

@@wellrose17 If you want a simpler explanation, you notice those angle markings? When the angle at which the light hits the glass is lower than around 42°, it's slightly bent, which is shown in the beginning of the video. When it is at exactly 42° (the critical angle), the light is dispersed, forming a spectrum (the rainbow stuff you see around 0:56). After that, when the angle is higher than 42°,the light is instead reflected, which is the Total Internal Reflection in the title of the video. If you want specifics, the dude above me did it pretty damn well.

@beactivebehappy9894

3 жыл бұрын

@@Blade.5786 she is not a dude!!😅😅👌👌 Keep it up guys zz

0:56 Here he crossed the Critical Angle of glass that is 42°. At this point, the refracted ray is along the glass-air interface. After crossing that angle, no refraction occurs and only reflection takes place :)

@tuahdanish1

2 жыл бұрын

So that's why in the books it says 42°

@arpitadutta4073

2 жыл бұрын

@@tuahdanish1 Yes... What else did you think?

@tuahdanish1

2 жыл бұрын

@@arpitadutta4073 huh wdym

@arpitadutta4073

2 жыл бұрын

@@tuahdanish1 Nothing much😁 Just asking🤠

@EvilDudeLOL

2 жыл бұрын

Refractive index of glass is about 1.52. However, after applying formula of refractive index (sin i/sin r, included that the critical angle of glass is 42°), the result is about 1.49. So, a better representation for the critical angle of glass would be 41°, because when applied it is about 1.52 (or closer anyway).

A teacher once asked me what can be learned from silence then immediately said nothing can be learned. And just now by the sound of silence ive learned more than that teacher ever taught me.

Everything would be so much better if teachers taught like this

@SAFIS448

3 жыл бұрын

Yeppp

@q_q123

3 жыл бұрын

yeah, cause you can actually SEE what's happening

@andyowens5494

3 жыл бұрын

Good teachers do. Everything would be so much better if ALL (physics) teachers taught like this.

@cpgautam172

3 жыл бұрын

It's extremely easy to imagine this, but for other topics it might help to see things practically

@damnnn29

3 жыл бұрын

@@cpgautam172 fr

00:50 and there's your rainbow. although, there is no rain, so lets just call it a light dispersion ray.

@silentHunter123

3 жыл бұрын

that is dispersion bro u dont need rain for that

@silentHunter123

3 жыл бұрын

just the radii of curvature of two surfaces must be different

@Metal_Master_YT

3 жыл бұрын

@@silentHunter123 did you not even fully read my comment? I already said it was dispersion! And yes, I already know that the the refraction, reflection and refraction again, of light through two materials that have a different refractive index and are at different angles relative to the direction of travel of light, will separate light into its constituent visible colors! XD

@ivanshuyadav566

3 жыл бұрын

@@Metal_Master_YT looks like someone got triggered 🙃

@Metal_Master_YT

3 жыл бұрын

@@ivanshuyadav566 well, actually I'm not very upset, I just thought it was hilarious that somebody could be so blind when commenting. 😂 (no offence Shashwat Saxena)

Everybody can actually observe Total internal refraction by opening their eyes underwater and looking up to the surface of the water. (Either in the ocean, but also a larger bath tub will work.) You will typically see: 1: A central, circular area which forms at the water surface and in which you may directly observe the surroundings above the water surface (e.g. the sky). In the video, this corresponds to the light ray exiting the glass. 2: Outside of that central spot however, the underwater enviroment is mirrored. (In dark underwater enviroments this part of the water surface is often darker or even black. In a bathtub or any really bright enviroment however, this might take on more the appereance of a bright mirror image.) So the angle at which that circle sits indicates the angle of total internal refraction. (And of course it is not a perfect circle, but quite distorted by waves.) This explains the typical look of underwater images facing up to the surface.

I remember from 60 plus years ago being taught about reflection, refraction etc but haven’t seen this. Jolly good demonstration and very interesting.

this guy has awsome aim and accuracy, he is probably a pro at csgo lol

@kshitishsorte2918

4 жыл бұрын

headshot

@sanjith.k1983

4 жыл бұрын

PATT se 😂

@melodybeats2439

3 жыл бұрын

Yaa

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@overlordprincekhan

3 жыл бұрын

@@Vetrivel.Shanmugam light is Not a fluid. It's an electromagnetic wave.

The light source is a standard school ray box. If you're after a similar source I would actually recommend using a laser spirit level - they produce much brighter beams and can be bought fairly cheaply from most DIY stores!

@PUROHITANIL7

3 жыл бұрын

How to get these materials Is it possible with Rectangular glass slab And using domestic led torch How to make a slit.. Please answer Thanks

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@metawhirl4609

3 жыл бұрын

@@Vetrivel.Shanmugam than tell me the density of fastest flowing water

@eobardthawnemcoc

3 жыл бұрын

@@metawhirl4609 it's probably a bot... They are replying to every comment same msg

@traumatizedmacasio8682

3 жыл бұрын

Yes

I've been watching professor Julius Sumner and his demonstrations of physics peaks my interest into the subject. It's demonstrations like these that get me excited to learn. Thanks for the vid.

0:56-0:57 -> Critical angle 0:58 -> Total internal reflection starts Love this video ❤❤❤ thank you for uploading ☺

This is the first time I got actual feel of Total Internal Reflection I really appreciate this video,,,and would love to see more such phenomena practically

@kurkurehatake878

3 жыл бұрын

@@vipinchand3956 me too bhai😅😂

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@ignacio4244

3 жыл бұрын

@@Vetrivel.Shanmugam callate aweonao

@DoseofScienceDoS

3 жыл бұрын

To bad this isn't total internal reflection. So you learned nothing

@daddy677

2 жыл бұрын

@@Vetrivel.Shanmugam naah light isn't a fluid I think u should study what's light and how the fluid is defined

After watching this I realized Science wasn't borning subject, the teacher was.

@tasneemmohiuddin8380

3 жыл бұрын

*ALWAYS*

@HelloHiHelloHiHello

3 жыл бұрын

So what you found interesting? Economics?😂

@HD-ji2bv

3 жыл бұрын

@@HelloHiHelloHiHello Nope...Reproduction 😂😂😂

@teddanville6996

3 жыл бұрын

if you study to become the teacher, you would understand why you can't do anything to make the lecture more interesting.

@simplememelord

3 жыл бұрын

Math 😎

PERFECT demonstration !! From refraction to total internal reflection, once critical angle is passed.. + a look at how reflection already happens to a small extent just before achieving i=C. TQ !! 👍🏻👍🏻

When i really REALLY NEEDED THIS YESTERDAY and i am getting this recommend AFTER MY PHYSICS EXAM

@cat1196

2 жыл бұрын

Don't worry, the next time you have a chance you can watch it save it in *watch later* as a folder

Meanwhile in India "The formula of critical angle for TIR is.."

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@goutham2433

3 жыл бұрын

Good one.

@badhil4468

3 жыл бұрын

Critical angle = sin^-(refractive index of air/refractive index of glass)

@StarryxNight5

3 жыл бұрын

I honestly did not get a goddamn thing from my lessons on reflection. So uninteresting. And that's from the guy who read the textbooks for fun a bit ago.

@sujalghorse4088

3 жыл бұрын

Sin theta equals refrative index of air/medium

My School Teacher :- Keep Pencil* On The Other Side And See It's Reflection! Edit :- Pencil's Spelling Was Wrong 😅.

@yuganshdhingra6645

3 жыл бұрын

😂😂😂

@kartikkala4757

3 жыл бұрын

Same😂😂😂😂😂

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@drahprub7750

3 жыл бұрын

Well, that's one way to see it, i guess. When total reflection happens, you won't see the pencil.

@kryskrys6428

3 жыл бұрын

@@Vetrivel.Shanmugam how can the speed of light be calculated ?

Never seen such a beautiful way of explaining this concept...it was not only interesting to watch it happening live but quite useful to understand the theoretical concept easily 👍... great work 👍

have physics experiment exam tomorrow, hoping to pass it. thanks for the video👍

@sasquatched6452

Жыл бұрын

good luck amali spm bro

Glass when i>c: Maybe I am a mirror.

This was so satisfying to watch.. It put a smile on my face.. This video showed the TIR phenomenon in a few minutes which was not possible for my teachers in an entire year. Thanks!!

I LOVE THIS VIDEO. AS A GRADUATE GEMOLOGIST I USE TOTAL INTERNAL REFLECTION WHEN I TAKE REFRACTIVE INDEX READINGS AS PART OF THE PROCESS OF IDENTIFYING A GEMSTONE. BIG FUN!

@urzsulaz2604

2 жыл бұрын

I would like how do You make that Can You tell me about?

@brianhudson7822

2 жыл бұрын

@@urzsulaz2604 A standard, good quality gemological refractometer is what is used. There are several videos available on KZread that provide information on how to use it.

This was so well demonstrated. Magnificent!

See you when this gets recommended to everyone 😉

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@a_balloon

3 жыл бұрын

See you when like beggers stop posting overused recommendation comments everywhere

@Felixrizzlord

3 жыл бұрын

@@a_balloon so true🤣🤣

@sigmaswan2969

3 жыл бұрын

B

@karelspinka3031

3 жыл бұрын

I made one Google search about critical angles and KZread recommended me this. If this isn't proof that I'm being spyed, then I don't know. 😁

Excellent, as a student gemmologist, I find that this is an excellent video for studying refraction and Total Internal Reflection (TIR). Towards the end of the video, you were going towards the critical angle, where the angle of incidence is at such an angle that the angle of reflection is both reflecting and refracting along the optically dense media. Thank you for the superb video, I would definitely recommend it to my fellow student gemmologists.

Thank you!!!!!!! I can't tell you how much of pain I endured before this! Thank you soo much!

I'm a graduate in physics but I did see this for the first in my life. I love TIR.

I really appreciate the clean and well explanatory setup for this ... It might look simple but an art in itself... 🔥 Jai shree ram 🙏

The perfect demonstration i wanted to see.Thank you.

Even No words required to explain and class's every student understands the concept...

This is one of the coolest videos on KZread that I've seen.

Such a beautiful demonstration. I wish physics teacher actually showed us experiments rather than being worried about quickly completing syllabus. I think nothing can match the clarity that experiments provide. First the experiment should be demonstrated and then from their we should connect it to the theory That will make physics a better experience for most students

Must watch video for all science students. Doing experiments and learning from practical experience is better than text book images when it comes to scientific knowledge.

"If you're feeling science is boring, then you're learning from wrong teacher"

@cgv3767

2 жыл бұрын

Are u real Elon Musk ?

@elonmusk1059

2 жыл бұрын

@@cgv3767 yup, what's the matter

@theaccordian9377

2 жыл бұрын

Wow you must have learned so much watching a beam of light with no explanation.

@elonmusk1059

2 жыл бұрын

@@theaccordian9377 I'm not saying anywhere that this teacher is wrong or right.

Wow this video is 10 years old but You Have given practical knowledge on TOTAL INTERNAL REFLECTION. Mujhe to bahut achhe se smjh aaya dekhkr

Really Really great demonstration. It was clear, self-speaking and tidy. Great job!

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

One of the best video I've seen in KZread in my life, If we don't use these amazing videos to educate students, this digital world would be a waste This is called the real learning. Thank you for this magnificent video

Thank you for this amazing experiment !!!

I teach physics to ESL students and this is extremely helpful in explaining critical angle and total internal reflection

Love this man.... You cleared all my doubts of geometric optics in just 1:43 min... 😍😍😍😍😍 A fan of your and your kind work..... Please keep helping student like me....... Love from india....

Simple and very clear. Great job!

I’m Korean and my physics teacher in high school showed this vid to us. It was very helpful to understand total internal reflection 😆

You explained SO MUCH with absolutely zero words. Inn redible.

9 years later KZread algorithm decides to recommend this

The answer to the universe and everything is 42. The critical angle was 42 ,so this is proof :) Jokes aside, cool video.

@florence6654

5 жыл бұрын

can you explained to me what is a critical angle ?

@hrekh3676

5 жыл бұрын

@@florence6654 the angle above which no light energy is referacted but it gets reflected from the surface

@hrekh3676

5 жыл бұрын

@@florence6654 0:58 here the critical angle is approximately 42°

@passionatepeople9456

5 жыл бұрын

Fuck it's incident ray angle(42) for which ray make critical angle(90)on the edge

@coxing6184

4 жыл бұрын

@@florence6654 the incident angle in which the refracted angle equals to 90 degree

Perfect Video. no Music NO inane commentary something a half decent teacher in a mud hut in the middle of Africa could use to demonstrate he concepts involved. at my school we had the equipment, but videos like this mean that NO Pupil in the world needs to be ‘deprived” more please.

You taught me more than 10 years in school man , appreciate it

0:55 or 0:56...you can see the seven colours... amazing way of learning... thank you 😄😄

Physics tell us how our universe work, real demonstration should be in daily school learning to make student more understanding the basic concept of physics

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

9 years old but still rocking the algorithm don’t know why it came up in my recommended but it did and i’m happy about it.

[2023-11-11] We did this experiment in my 8th-grade (Jr. High) "Light" class almost a half-century ago (c. 1974). We had to observe and collect data of the exiting light's refraction angle at various angles of incidence into the glass block and determine at which angle of incidence, the light was internally reflected by the straight face of the block-scientific ideas on the properties of light, being introduced to 13-year-olds. Fascinating that the light apparatus hasn't changed in all those years. The screen in the apparatus can be inserted upside down (with the 3-slit side down) which would allow us to see the interference pattern of light emanating from the apparatus (demonstrating the wave properties of light). You can also see the interference in the lone beam emanating from the apparatus, as light tries to spill, at various intensity, either side of the primary beam.

Wow amazing - I studied that in physics 30 years ago and loved it but now I love it more after watching this video - I like the rainbow near the end of this video

Schools should also start practicals like this it will be better for students to learn the concept clearly

this is amazing! I used to know abstractly what it is until you show this experiment.

Got this video after 10 years. And still enjoyed this.

so beautifully demonstrated

@ZigSputnik

7 жыл бұрын

'beautifully' is a little strong I feel!

@OnlineClassesETEATricks

3 жыл бұрын

Plzzz Subscribe our youtube channel u will get alot there kzread.info

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

The man is underrated

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

what a beautiful demonstration, thank you.

thank you for the video sir it really explains about the critical angle and the internal reflection phenomenon of the light... these days having observation like this physically is not possible.. cuz people don't give enough effort or time to do these ... this video really creats better understanding..

Fantastic sir. I love the way you teaches physics sir

This video permit me to finalize my raytracer reflection algorithm, thx

Wonderful demo. There's so much information contained in it.

Now I believe everything total internal reflection says about light rays. This man is the ultimate teacher

This is beautiful, I've looked at it for 5 hours now. P.s. Got this in my recommendations after 9 years. xD

Great work...used with my year 10 lesson to show TIR. Very clear work, thanks :)

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@BloodAssassin

3 жыл бұрын

And now this video is in everyones reccomended after 9 years....

IDK how to explain this but this video is extremly aestheticly pleasing and i love it alot for somereason

Glad this is finally practical! So happy to see that this isn't some abstract topic we learn in class and that's that. Happy to see it exists for real and isn't just another theory

Thanks for the video, revising for my test tomorrow and you sure did help! :)

@umangsoni17

3 жыл бұрын

Have u completed ur school

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

Thanks a lot sir! All of your videos are really helpful! Sir please make a video demonstrating a difference between virtual and real image! Please sir! This would be a great help for me! Hope you'll help!

You saved my life! Thank you so much!

one of the best videos on youtube!

I was surprised when i saw a portion of light getting totaly internally reflected very early than i thought.

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@massoudkamal5155

3 жыл бұрын

@@Vetrivel.Shanmugam I mean it’s also a solid if you think real hard about it

@theairaccumulator7144

3 жыл бұрын

@@Vetrivel.Shanmugam and your brain is the slowest and smallest falling solid

@akay4086

3 жыл бұрын

and that portion of light will introduce you to another topic called polarisation of light.

@group1812

3 жыл бұрын

@@akay4086 That's Amazing...❤️

this video is so good that my physics teacher gave the students a link to this video

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

This is what Real Learning really is when you see something Practically, you learn it more precisely than anyone else

Thank you very much. Total Internal Reflection is not an easy concept to understand and this video makes the concept so easy.

This is an amazing!! I would like to make a demonstration for my children. Could you please let me know what light source you used for this, and how you made the housing for the light source?

@QuantumBoffin

2 жыл бұрын

The light source housing was bought from an educational seller, but a suitable set up could easily be constructed using a 12v bulb and some cardboard (be careful if the bulb gets hot thought. To be frank, though, the best way to do the experiment is to use a laser pointer instead of a bulb. They can be purchased for very little money and are very bright.

damn! if teachers taught all of physics like this, i would have become a physics professor 🔥🔥🔥

Thank you so much, that's so accurate and clear to understand this concept!!

Thank you so much! I can't understand a thing in my class. My professor just reads her presentation and no examples were presented. Thank you!

I'm so happy this is what called real learning...😀

thank you the video helps me a lot

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

Thank you so much! You are a true legend

GREAT demonstration this is how you capture young minds with results bravo

People like you make quantum physics wonderable ❤️🔥! Appreciated man!!👍

TIR is one of the most interesting topic in Ray optics chapter class 12 Cbse

very interesting... your explained it without even saying a word.. this is awesome

I think it's the real way for learning ❤❤❤❤❤❤❤thank you For giving the practical explanation

Everybody got this in their recommended in February 2021 after 9 years

@kparker2430

3 жыл бұрын

weird; that's what i thought...like the algorithm was saving it up for precisely now.

This is an excellent demonstration! I finally understand now! Thank you do much :D

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@BloodAssassin

3 жыл бұрын

And here we are reccomended in 2021, you're comment is the the oldest comment I could find

Practical is 100 times better than theory 👌 You proved it today 👍

It’s also really cool to see that light really do bend around corners

i found this video very relaxing

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@BloodAssassin

3 жыл бұрын

Supp

And the degree of total internal reflection for glass is=42° 49°for Water and 24°for Diamond

OH MY GOX THANKS SOO MUCH I had been taught about total internal reflection but understood nothing and was curious as to what it is. Thanks to you i now know

Watched total internal reflection as well as dispersion of light!! Woah!! You demonstrated it excellently💫🌈

1:43 difracción, so beatiful

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@ganges2264

3 жыл бұрын

@@Vetrivel.Shanmugam fluid ? Isn't light made up of waves and particles ?

@Vetrivel.Shanmugam

3 жыл бұрын

@@ganges2264 Just like light, fluids are made of waves and particles. Everything around us that we see is made of fluids and non-fluids(solid). Light should fall in fluids because we know for sure it isn't a solid but that isn't enough. Light flows in straight line, any fluid that flows in extreme high speed, will flow in a straight line so light can be a fluid.

@ganges2264

3 жыл бұрын

@@Vetrivel.Shanmugam ah thanks for telling me. However it's very hard to determine light as a fluid considering it breaks so many of the fundamental laws about fluid. Light can be bent , it can be reflected , it can physically pass through transparent objects and it can be warped when around blackholes. I think there are other ways to classify this bcs light is the only thing in the universe that doesn't have mass , which fluids fundamentally need.

@Vetrivel.Shanmugam

3 жыл бұрын

@@ganges2264 Thanks, one more important thing I forgot to put it. Just like fluids, light flows, and it flows parallel inbetween spaces. blackholes doesn't bend light, it bends the space whereas light simply flows through the bent space. Light has mass, its mass element is called photon.

this guy is amazing at hand control

@Vetrivel.Shanmugam

3 жыл бұрын

Light is the lightest and fastest flowing fluid

@surtmcgert5087

3 жыл бұрын

@@Vetrivel.Shanmugam lights not a fluid

You are Best teacher of optics

Critical angles around 40 so tir occurred when you went above that. Amazing!