A ray of light is incident on the mid-point of a glass prism surface at an angle of 20° with the normal.For the glass,n = 1.60,and the prism apex angle is 40°.What is the angle of incidence at the glass-to-air surface on the side opposite where the ray exits the prism? The surfaces involved are those of the apex angle.

Question

Quizplus · Accepted Answer

Using Snell's Law at the first surface and geometry of the prism, the angle of refraction inside the prism is calculated. Then, using the prism's apex angle, the angle of incidence at the second surface is determined.

A Ray of Light Is Incident on the Mid-Point of a Glass