suggest how your irises help to protect' the retinas of your eyes from damage by bright light.

The descriptions of five kinds of images are given below:

(a) diminished and virtual (b) enlarged and real

(c) enlarged and erect (d) real and inverted

(e) virtual and the same size

Which one of these describes the image formed:

(i) on the retina of the eye?

(ii) by a magnifying glass?

(iii) by a convex driving mirror on a car?

(iv) by a plane mirror?

(v) on the screen of a slide projector?

What shape are your eye-lenses:

(a) when you look at your hand ?

(b) when you look at a distant tree ?

Which parts of the eye cause rays of light to converge on the retina ?

Which part causes the greatest convergence ?