Make two diagrams to explain refraction and dispersion.

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?

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.

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

How could you show that the colours of the spectrum combine to give white light ?