Total Internal Reflection

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An experiment demonstrating the total internal reflection of light inside a glass block. An angular scale is provided allowing the critical angle of the glass to be measured and the refractive index of the glass to be determined.

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

muhammadjafri

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

infinitelyfinite

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 :)

arpitadutta

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.

sundaeram

Everything would be so much better if teachers taught like this

rajeshpandey

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!

QuantumBoffin

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.

ChristianMiersch

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

royksk

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

Metal_Master_YT

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

mancheeeee

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

swordsman

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

kshitisedits

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

vipinchand

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

HD-jibv

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.

jestnutz