Q54 of 234 Page 272

What shape are your eye-lenses:
(a) when you look at your hand ?

(b) when you look at a distant tree ?

(a) the shape of the eye lens when you look at your hand is thick (more convex).

(b) When you look at a distance tree the eye-lens will be thinner (less convex).

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

The descriptions of five kinds of images are given below:

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

(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?

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

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

What shape are your eye-lenses:(a) when you look at your hand ?(b) when you look at a distant tree ?