How can you recombine the components of white light after a prism has separated them ?

Describe the activity to show that the colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light.

Out of the following, which light is deviated minimum in the dispersion of white light through a glass prism?

Why do we get different colours in the phenomenon of dispersion of white light through prism?

How the analysis of chemical components can be done ?

How can you charge a metal sphere positively without touching it