What will be the angle of deviation through a prism and 60°, when angles of incidence and emergence are 45° each?

Question

Philoid · Accepted Answer

Given: Angle of prism, A = 60^o

Angle of incidence, i = 45^o

Angle of emergence e = 45^o

To find: Angle of deviation = D

We know

A + D = i + e

So, D = i + e – A

D = 45^o + 45^o – 60^o

= 30^o

Hence angle of deviation is 30^o