Question

The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let D₁ and D₂ be angles of minimum deviation for red and blue light respectively in a prism of this glass. Then

(a) D₁ > D₂ 

(b) D1 < D₂

(c) D₁ = D₂

(d) D₁ can be less than or greater than depending upon the angle of prism.

Answer 1

(b) : Angle of minimum deviation D = A(μ – 1)