Draw a diagram to show how white light can be dispersed into a spectrum by using a glass prism. Mark the various colours of the spectrum.

What is meant by dispersion of white light? Describe the formation of rainbow in the sky with the help of a diagram.

In the figure given alongside, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum YX on the screen.

(a) State the colour seen (i) at X, and (ii) at Y.

(b) Why do different colours of white light bend through different angles with respect to the incident beam of light?

Make two diagrams to explain refraction and dispersion.

Describe how you could demonstrate that white light is composed of a number of colors.