Question

A ray of light is incident at an angle 52 degree on the face of quadrilateral prism and gets deviated through 34 degree find its angle of emergence​

Answer 1

Answer:

Correct option is D)

By snell's law of refraction 

μ=sinr1sin530       at first  refraction on surface AB

μ=sinr2sin370        at surface AC

when ∠i decreases it means angle ∠r1 also decreases because refractive index is constant.

 

from the following reason we can conclude that 

∠r1+∠r2=1800−A

when ∠r1 decreases then angle ∠r2 must increase.

therefore if ∠r2 increases then  ∠e also increases.

In short we can say that if  ∠i slightly decreases then  ∠e slightly increases and vice versa

 

By solving equation 1 and 2 we get,

if angle of incidence become 50 degree then angle of emergence become 38 degree.

Option D is correct