Draw a simple diagram of the human eye and label clearly the cornea, iris, pupil, ciliary muscles, eye �

lens, retina, optic nerve and blind spot.

What happens to the size of pupil of our eye

(i) in dim light (ii) in bright light ?

Name the cells on the retina of an eye which are sensitive to

(i) bright light (ii) dim light (iii) sensation

Describe the working of the human eye with the help of the above diagram.

How does the eye adjust itself to deal with light of varying intensity?