Question

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

Answer 1

Answer:

When we look at our hand, the eye lens is thick. When we look at a nearby object, the eye lens becomes thick or more convex to converge the rays of light from the nearby object (our hand) to form an image on the retina.

(b) When we look at a distant tree, the eye lens is thin. When we look at a far-off object, the eye is in a relaxed state. The eye lens becomes thin or less convex because a small converging power of the eye lens is sufficient to focus the parallel light rays from the distant object (the tree) to form an image on the retina.

Answer 2

Answer:

(a) The shape of our eye - lenses are thick.

(b) The shape of our eye - lenses are thin.