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-:

(i) Long distance radio broadcasts use short-wave bands. Why ? (ii) Optical and radio telescopes are built on the ground, but X-ray astronomy is possible only from satellites orbiting the Earth. Why ?

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.