Question

Draw the path of light ray passing through a prism and label the angle of incident and angle of deviation

In the following diagram, the path of a ray of light passing through the glass prism is shown. In this figure the angle of incidence, the angle of emergence and the angle of deviation are-:

A ray of light passes through a triangular prism. Show graphically, how the angle of deviation varies with the angle of incidence ? Hence define the angle of minimum deviation.

A ray of light is incident normally on a refracting face of a prism of prism angle A and suffers a deviation of angle δ. Prove that the refractive index n of the material of the prism is given by n = sin(A + δ)/sin A.