In the figure given below, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum XY on the screen.(i) Name the phenomenon.(ii) State the colours seen at X and Y.(iii) Why do different colours of white light bend at different angles through a prism ?

In the figure given below, a narrow beam of white light is shown to pa

1.	In the figure given below, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum XY on the screen.(i) Name the phenomenon.(ii) State the colours seen at X and Y.(iii) Why do different colours of white light bend at different angles through a prism ?
Answer» Solution :(i) It is dispersion of light. (ii) X - Violet COLOUR, Y - Red colour (iii) As light of DIFFERENT COLOURS travels with different speed inside the prism, hence different colours BEND at different angles.