Question

A source emits visible light.

The diagram shows a ray of red light from the source incident on the face XY of a glass prism at

point S.

The angle of incidence i of the ray is 35 °. The refractive index of the glass for red light is 1.5.

(a) Calculate the angle of refraction in the glass at S.

Answer 1

$$\sin{a}=\frac{\sin{b}}{n}\\ a=\arcsin{\frac{\sin{b}}{n}}\\ a=\arcsin{\frac{\sin{35}}{1.5}}=22.5\degree$$