Question

4. The angle of minimum deviation of a prism is D = 30 degree (angle A =60 degree) then its refractive index is​

Answer 1

Answer:

Correct option is

D

2cos(15∘)

Minimum deviation  δmin=30∘

Angle of prism  A=30∘

Refractive index of prism

μ=sin(A/2)sin(2δm+A)

μ=sin 15sin 30

μ=sin 152sin 15cos 15

μ=2cos 15