Total Internal Reflection and Critical Angle - A Level Physics

[@nightly4303]

I'm confused in the majority of my Physics lessons but this was well explained and I understood. Subbed and liked!

[@DapaChrons]

Our class is online at the moment because of the virus and this video helped me loads!

[@BFR-jc5np]

9 months later, and now I'm in your position

[@ollie4893]

You explain things so clearly, I thought I was gonna fail my waves assessment till I found this. Thank you so much :)

[@PhysicsOnline]

Thanks for your kind comment. Physics is not easy but I do feel that even hard concepts can be explained simply.

[@a.k.mdelwarhossain8079]

if i could have found this channel 2 months ago that would have helped a lot :'(

[@jarajlondon]

Argggg... great channel But I guess it's too late now!! GL every1

[@ramniwassaini1956]

Very thank you sir you are really a great teacher i wish if you were my physics teacher

[@sea5205]

Great video, my teacher couldn’t say this!

[@karenmatimura4821]

I love this!!! thank you so much!!

[@MrGregasaurusrex]

Thank you so much! Your videos are very helpful

[@arianahossain5844]

Thank you so much :)

[@I3uzzzzzz]

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[@xanderbulter-davies5800]

Life saver mate

[@abubardewa939]

Your videos are really good! U can send these videos to Khan academy ... They are looking for tutors like you .

[@PhysicsOnline]

Abu Bardewa I'll look into that, I didn't know they were looking.

[@MarkySharky]

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[@muhammadhussainsarhandi9928]

@@PhysicsOnline Sir please tell me what light source you are using here? Where can I buy it?

[@inesclement4059]

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[@discospaghetti6744]

Such a clear explanation

[@Noobmaster_x69]

Good explaination with experiments thnx helped me lot

[@DXPAlien]

you are the best sir 💟

[@subrahmanyamgadhamsetty3933]

very nice demo. thanks

[@mariehill6547]

I’m still a bit confused on exactly how an optical fibre is able to reflect light so perfectly? I don’t understand how the difference in the cladding and the core’s refractive index affects the way in which light is reflected and able to pass through the structure.

[@rshekhar77]

very well explained

[@edithko7938]

is this useful for the OCR spec?

[@_trm_4339]

learning this for gcse

[@somireddytrivenireddytejud1468]

Nice!!

[@jfernandes_25]

Hi sir, I had an exam question where you had to continue a ray after it hits cladding and it says it hits at the critical angle(2 marks) So I did a line at the boundary and got a mark however why is it you need to show reflection for the 2nd mark as it is not totally internally reflecting is it(if it's at the exactly the critical angle)? Thank you.

[@Rayykuu]

So if angle of incidence is bigger than critical angle then TIR occurs?

[@abhishekkhandare8045]

please answer this question if there is a total internal reflection how can we see bright light in optical fiber because we se li

[@dazikenhd364]

Equation at the end, is it sinC=N of material from/ N of material to ?

[@DapaChrons]

n1, your "n of material from" should be on the bottom. sinC = n2/n1

[@Hackupable]

Just want to make things clear I have a few questions. So if n1 has a smaller refractive index than n2, the wave entering n2 will go towards the normal? And so if the a wave was entering from air (n1) to water (n2) at angle of around 67 to the normal, would the wave in n2 change direction towards the horizontal or would it change direction towards the normal?

[@lotnewlifewhy5190]

Towards the normal right? Unless it's a sound wave and not a light wave, because in water the sound waves will actually travel faster as water has a higher density than air, which would cause the sound wave to move away from the normal in that case.

[@tobias-edwards]

Is there partial reflection at the critical angle? If there was an exam question like this, would I draw partial reflection alongside light travelling along the boundary? Thanks

[@krypton1142]

did u get an answer

[@Mercy.O.]

how do you know which refractive index goes at the top and bottom

[@marshaburgess8397]

The first material the light goes through is n1.

[@Mercy.O.]

+Marsha Burgess Thank you so much my exam is today 😊

[@marshaburgess8397]

+Mercy Odunsi Same! Good luck, we need it!

[@sadiadiis5387]

Your English is realy hard