Why does the human eye observe the different colors of the rainbow?

a)different colors of light travel at different speeds to the eye.

b)white light is broken down in the eye into its separate colors.

c)the eye sees different wave lengths of light as different colors.

d)the eye sees different colors of light in different locations of the eye. some colors are seen in the back of the eye and others in the front.

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?