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

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

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 :)

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

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

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.

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

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

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!

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

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

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

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

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.

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

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

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

9 years later KZfaq algorithm decides to recommend this

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 !! 👍🏻👍🏻

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

See you when this gets recommended to everyone 😉

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 👍

This was so well demonstrated. Magnificent!

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

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!!

Sometimes I just love the randomness of youtube's algorithm that shows me this kind of content

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

One of the best video I've seen in KZfaq 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

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

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

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

The man is underrated

so beautifully demonstrated

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.

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

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.

The perfect demonstration i wanted to see.Thank you.

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

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

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

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

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

[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.

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.

Thank you for this amazing experiment !!!

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

Simple and very clear. Great job!

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....

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

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

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

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

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!

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

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

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.

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

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

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

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

one of the best videos on youtube!

Fantastic sir. I love the way you teaches physics sir

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

what a beautiful demonstration, thank you.

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

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

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

You saved my life! Thank you so much!

This is the Definition of "Silence is the best answer"

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

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

Thank you so much! You are a true legend

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

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

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

That is so beautiful!

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

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

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?

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

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

1:43 difracción, so beatiful

Light source: Moves to 45° Refracted ray: My time has come

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

Excellent demo.

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!

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

wonderful demostration

What a brilliant example. Thanks.

thank you the video helps me a lot

who got this on their recommended 9 years later?

It's really cool to see the refraction splitting the light into the rainbow

What is also cool is the dispersion of light that is also briefly visible as well as (ig?) the diffraction that occurs at the hole of the light source.

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

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

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..

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