Question

by using to prism how do we get white light

Answer 1

Place the glass prism in such manner that the sunlight through the window falls on one side of the prism and then on the white wall. You can see that thelight reflected on the wall has several colors. The prism splits the white lightinto seven different colors

Answer 2

If the light of seven colours passed through prism then we again get white light. The seven colours are VIBGYOR