Question

A prism has index of refraction of n = 1.2 for red light, and an apex angle of A = 33º. What is the minimum angle of deviation for this color of light? Round your answer to two decimal places.

Answer 1

Minimum angle of deviation (D) is given by,

n = sin[(A + D)/2] / sin(A/2)

=> sin[(A + D)/2] = n sin(A/2)

=> D = 2sin^-1[n sin(A/2)] - A

=> D = {2 * sin^-1[1.2 * sin(33^o/2)]} - 33^o = 6.85^o