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In figure, light refracts from material ...

In figure, light refracts from material 1 to a thin layer of material 2, crosses that layer, and then is incident at the critical angle on the interface between materials 2 and 3.
(a) What is the angle `theta`?
(b) if `theta` is decreased, is there refraction of light into material 3?

Text Solution

Verified by Experts

The correct Answer is:
A, B, C
`mu_1 sin i_1=mu_2sin i_2=mu_2sin theta_C`
`(1.6) sin theta=(1.80)(1.30/1.80)`
`:. theta=sin^-1(13/16)`
If `theta` decreased, then `i_2` will decrease from the value `theta_C.` Hence, refraction will take place in medium-3.
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