Question

One face of a prism with a refractive angle of 30° is coated with silver. A ray incident on another face at an
angle of 45° is retracted and reflected from the silver coated face and retraces its path. What is the refractive
index of the prism?​

Answer 1

optical prism is a transparent optical element with flat, polished surfaces that refract light. At least one surface must be angled—elements with two parallel surfaces are not prisms. The traditional geometrical shape of an optical prism is that of a triangular prism with a triangular base and rectangular sides, and in colloquial use "prism" usually refers to this type. Some types of optical prism are not in fact in the shape of geometric prisms. Prisms can be made from any material that is transparent to the wavelengths for which they are designed. Typical materials include glass, plastic, and fluorite.