Question

Write a relation for the angle of deviation (δ) for a ray of light passing through an equilateral prism in terms of the angle of incidence (i₁) angle of emergence (i₂) and angle of the prism (A). 

Answer 1

The relation is i₁ + i₂ = A + δ

Replacing i₂ by e the angle of emergence.

i₁ + e = A + δ or [δ = (i₁ + e) - A]