Question

A rectangular glass slab having refractive index √3 is silvered at one surface as shown in figure. Light ray will deviate by angle _____ when it cross the glass slab.
(1) 110°
(2) 100°
(3) 90°
(4) 120°

Solution with explanation. Please give explanation, or else I won't understand.
Please avoid giving irrelevant answers...
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Answer 1

Given that

θ=30°

if wall does not present then the light will follow a-b-c path but due to wall it deviate from original path and known as deviation of ray.

lets take deviation angle is δ.

We know that

θ + δ = 180°

θ=30°

δ =  180° - 30°

δ =120°