Total Internal Reflection and Critical Angle - A Level Physics

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This video introduces and explains total internal reflection and its relationship with the critical angle for A Level Physics.
Total internal reflection occurs when light reflects off of the boundary between two mediums. Where light gets refracted such that the angle of refraction is greater than the angle of incidence, at some angle, the light will be refracted at an angle of 90 degrees and is reflected instead. The smallest angle of incidence that this occurs at is called the critical angle.
Thanks for watching,
Lewis
This video is recommended for anyone studying A Level Physics in the following exam boards:
AQA
CIE
Edexcel
Edexcel IAL
Eduqas
IB
OCR A
OCR B
WJEC
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Опубликовано:

17 окт 2024

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Комментарии : 42

@nightly4303 7 лет назад

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

@DapaChrons 4 года назад

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

@BFR-jc5np 3 года назад

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

@ollie4893 7 лет назад

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

@PhysicsOnline 7 лет назад

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

@jarajlondon 9 лет назад

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

@ramniwassaini1956 2 года назад

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

@jfernandes_25 3 года назад

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.

@a.k.mdelwarhossain8079 9 лет назад

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

@I3uzzzzzz 6 лет назад

hello cool pen link for pen?

@sea5205 5 лет назад

Great video, my teacher couldn’t say this!

@abubardewa939 9 лет назад

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

@PhysicsOnline 9 лет назад

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

@MarkySharky 6 лет назад

I like Fortnite

@muhammadhussainsarhandi9928 4 года назад

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

@inesclement4059 3 года назад

@@PhysicsOnline 0

@xanderbulter-davies5800 2 года назад

Life saver mate

@edithko7938 5 месяцев назад

is this useful for the OCR spec?

@karenmatimura4821 9 лет назад

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

@Rayykuu 4 года назад

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

@abhishekkhandare8045 8 лет назад

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

@mariehill6547 5 лет назад

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.

@discospaghetti6744 8 лет назад

Such a clear explanation

@MrGregasaurusrex 9 лет назад

Thank you so much! Your videos are very helpful

@Hackupable 7 лет назад

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 Год назад

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.

@_trm_4339 2 года назад

learning this for gcse

@arianahossain5844 Год назад

Thank you so much :)

@Noobmaster_x69 8 лет назад

Good explaination with experiments thnx helped me lot

@tobias-edwards 7 лет назад

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