First slide

Ray optics

Question

${\mu _a},\,{\mu _b},\,{\mu _c}$ are refractive indices of the media A, B, C respectively, so that ${\mu _a} > \,{\mu _b} > \,{\mu _c}$ . The critical angle arises when a ray of light travels from

Moderate

A

C to A
B

C to B
C

B to A
D

A to C

Solution

To observe the critical angle the ray should move from denser to rarer medium as ${\mu _a} > \,{\mu _b} > \,{\mu _c}$ when light goes from A to B or B to C or A to C we will be able to observe critical angle.

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