Question

The diagram below shows the ray OP travelling through an equilateral prism of a certain material.

1. Calculate the value of i₂, if the angle of deviation is 43°.
2. What is the ray QS called?

Answer 1

a. Using Prism formula,

∠A + ∠δ = ∠i₁ + ∠i₂

60° + 43° = 65° + Li₂

∴ m∠i₂ = 38°

b. Ray QS is called the emergent ray.