List, in order, the parts of the eye through which light passes to reach the retina.

What are rods and cones in the retina of an eye? Why is our night vision relatively poor compared to the night vision of an owl?

How does the convex eye-lens differ from the ordinary convex lens made of glass?

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