What job does the pupil of the eye do ?

What happens to the pupil of the eye when the light is (a) very bright and (b) very dim?

The size of the pupil of the eye is adjusted by :

A person walking in a dark corridor enters into a brightly lit room : (a) State the effect on the pupil of the eye. (b) How does this affect the amount of the light entering the eye ?

What is the nature of the eye lens and what does the eye lens do ?

Answer the following questions : What is the use of the pupil in the human eye ?

The contraction of pupil of the eye in the presence of bright light is an example of:

The diameter of the pupil of human eye is about 2 mm . Human eye is most sensitive to the wavelength 555 nm . Find the limit of resolution of human eye.