Question

Describe an experimental setup to show that sunlight can be split up into constituent colours and then convert it back to white light

Answer 1

Sunlight can be split into its constituent colours with the help of a prism. It can be recombined to get white light again by placing an inverted prism beside the first one.
The steps for the experiment are
a. Place a prism with its base on a table close to a window.
b. Pass sunlight through a slit onto the prism.
c. Observe the white light getting split after passing through the prism.
d. Place another prism beside the first one with its base inverted with respect to the first one.
e. Observe the seven light rays merging and forming white light after passing through the second prism.