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.
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.
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?
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.
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
I'm confused in the majority of my Physics lessons but this was well explained and I understood. Subbed and liked!
Our class is online at the moment because of the virus and this video helped me loads!
9 months later, and now I'm in your position
You explain things so clearly, I thought I was gonna fail my waves assessment till I found this. Thank you so much :)
Thanks for your kind comment. Physics is not easy but I do feel that even hard concepts can be explained simply.
Very thank you sir you are really a great teacher i wish if you were my physics teacher
Great video, my teacher couldn’t say this!
Life saver mate
I love this!!! thank you so much!!
Argggg... great channel
But I guess it's too late now!!
GL every1
hello
cool pen
link for pen?
Thank you so much :)
Such a clear explanation
Thank you so much! Your videos are very helpful
if i could have found this channel 2 months ago that would have helped a lot :'(
learning this for gcse
Your videos are really good!
U can send these videos to Khan academy ... They are looking for tutors like you .
Abu Bardewa I'll look into that, I didn't know they were looking.
I like Fortnite
@@PhysicsOnline Sir please tell me what light source you are using here? Where can I buy it?
@@PhysicsOnline 0
you are the best sir 💟
is this useful for the OCR spec?
Good explaination with experiments thnx helped me lot
very nice demo. thanks
very well explained
please answer this question if there is a total internal reflection how can we see bright light in optical fiber because we se li
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.
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.
So if angle of incidence is bigger than critical angle then TIR occurs?
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?
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.
Nice!!
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
did u get an answer
Equation at the end, is it sinC=N of material from/ N of material to ?
n1, your "n of material from" should be on the bottom. sinC = n2/n1
how do you know which refractive index goes at the top and bottom
The first material the light goes through is n1.
+Marsha Burgess Thank you so much my exam is today 😊
+Mercy Odunsi Same! Good luck, we need it!
Your English is realy hard