Explain the refraction of light through a triangular glass prism using a labelled ray diagram. Hence define the angle of diviation.

Explain the phenomenon of dispersion of white light through a glass prism, using suitable ray diagram.

Define refractive index of a transparent medium. A ray of light passes through a triangular prism. Plot a graph showing the variation of the angle of deviation with the angle of incidence.

Define refractive index of a transparent medium. A ray of light passes through a triangular prism. Plot a graph showing the variation of angle of deviation with the angle of incidence. Hence derive prism formula.

(a) Draw a ray diagram showing the passage of light through a glass prism. Hence obtain a relation between the angles of deviation, incidence and emergence and angle of prism. (b) Show that no ray can pass through a prism whose refracting angle A is greater than twice the critical angle for the material of the prism.

What is meant by the 'angle of incidence' and the 'angle of refraction' for a ray of light? Draw a labelled ray diagram to show the angle of incidence and the angle of refraction for a refracted ray of light.

Complete the following ray diagram to show refraction of light through a glass slab and label the incident ray, refracted ray and emergent ray.