A light ray leaves a block of sodium chloride at an angle of

A light ray leaves a block of sodium chloride at an angle of 24 degrees and enters a block of polystyrene, n2= 1.59, at an angle of 23.2 degrees. Find n1 for sodium chloride.

Solution

From Snell\'s Law

n₁Sin(o₁)=n₂sin(o₂)

n₁*sin24 =1.59*sin23.2

n₁ = 1.54