How many times does a ray of light undergo refraction when it passes through a water droplet ?

How many seconds are there in a light fermi?

Write one word for a solution undergoes chemical change when electricity passes through it.

A ray of light undergoes refraction when it enters from air to glass.A picture is painted with blue, green and red colours. A glass slab is placed on this picture. Will the images of all these colours lie in the same plane in the slab when viewed from the top of the glass slab? Why?