What are the colors obtained by mixing primary colors called?

How are we able to see nearby and also the distant objects clearly?

The bluish colour of water in deep sea is due to

$(a)$ Demonstrate an activity with a well-labelled diagram to prove that white light is made up of seven colours.
$(b)$ Which colour of light bends least and which one the most while passing out from the prism? Also,state the reason for the same.

What is the role of the pupil in a human eye?

Light coming from the sun is white light and contains seven colours.