Worked example: Total internal reflection | Ray optics | Physics | Khan Academy

In this video, we solve a question on Snell's window and also deal with refraction and TIR across 3 mediums!

00:06 1st Question
00:51 Drawing all the light rays from the source
02:38 How do the light rays look when they are incident at critical angle?
03:01 Using Snell's law to calculate the critical angle
03:59 Relating critical angle with the angle subtended at the source
04:55 2nd Question
05:48 Comparing the refractive indices of the three mediums
07:43 Using Snell's law to relate the refractive indices of medium A and B

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