AP Physics LIGHT !!!!!?

Question

the corner of a prism (n=1.2) is a 45 degree angle. The incident light makes an angle (theta) with respect to the normal, as shown. if (theta) is larger than some angle (theta)o, the light is totally reflected at the second face of the prism. find (theta)o

Answer 1

Theta is a property of the material that was used to create the prism. Different kinds of clear material have different refractive indices.