A ray of light traveling in medium 1 (index of refraction n1 = 1.55, not air!) strikes the side of a prism along the normal. The prism is an isosceles triangle with base angle a = 32.7° and index of refraction n2 = 1.11. The ray passes through the prism and exits at point A (back into medium 1). It then strikes a plane mirror (parallel to the bottom of the prism and distance d = 20.5 cm away), reflects, and enters the prism again at point B. Find x, the distance between points A and B, in cm.

A ray of light traveling in medium 1 (index of refraction n1 = 1.55, not air!) strikes the side of a prism along the normal. The prism is an isosceles triangle with base angle a = 32.7° and index of refraction n2 = 1.11. The ray passes through the prism and exits at point A (back into medium 1). It then strikes a plane mirror (parallel to the bottom of the prism and distance d = 20.5 cm away), reflects, and enters the prism again at point B. Find x, the distance between points A and B, in cm.