Question

A horizontal beam of light goes through a glass equilateral prisim. Find it's direction (angle to the horizon) after it goes through the prisim. The index of refraction for glass is 1.4

Answer 1

So from the figure we see that the incident angle is

So from snell's law the refracted angle from the first surface is,

Now on the second surface the incident angle is,

So the refracted angle from the second surface is,

So the angle with the horizon is(Below the horizon)