Which optical phenomenon is responsible for the formation of a rainbow?

Describe an experiment to discuss the recombination of dispersed light.

What is dispersion of light? Name the $(i)$ component of white light that deviates the least,$(ii)$ component of white light that deviates the most,while passing through a glass prism.

Identify the phenomena of light involved in the formation of a rainbow.

$A$ glass slab is placed over a page on which the word $VIBGYOR$ is printed with each letter in its corresponding colour. $(i)$ Will the image of all the letters be in the same place? $(ii)$ If not, state which letter will be raised to the maximum. Give a reason for your answer.

$(a)$ 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.