Question

Consider a thin prism.

Find the deviation (in degrees)

(a) 178

(b) 2

(c) 179

(d) 1

Solution

We will use the formula of deviation for thin prism.

delta = A(mu-1), where A is prism angle and mu is refractive index of the prism.

delta = 2^0 (1.5-1)= 1^0

Then it will reflect by mirror, so final deviation will be

=> 180^0 -1 = 179^0

Therefore option (c) is correct.