Every colour travels with the same speed in a transparent medium.

Which of the following two colors are complementary colors?

Name the component of white light that deviates the least and the most while passing through a prism.

In the figure,a ray of light $PQ$ is incident normally on one face $AB$ of an equilateral glass prism. What are the angles of incidence at faces $AB$ and $AC$?

Which of the following phenomena is $NOT$ 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.