How many plane mirror strips are there in a kaleidoscope? How are they arranged?

What information do you get about sunlight from the formation of a rainbow?

What is meant by dispersion of light'? Name a natural phenomenon which is caused by the dispersion of sunlight in the sky.

How does eye adjust itself to deal with light of varying intensity?

Explain why, we cannot see our surroundings clearly when we enter a darkened cinema hall from bright sunshine but our vision improves after some time.