Question

How does the eye change in order to focus on near or distant objects?
(a) The lens moves in or out
(b) The retina moves in or out
(c) The lens becomes thicker or thinner
(d) The pupil gets larger or smaller

Answer 1

Answer:

The shape of the lens is changed by ciliary muscles so that the image forms at a sharp focus at the retina. The lens becomes thicker to focus at near objects and becomes thinner to focus at distant objects.

Answer 2

The lens becomes thicker or thinner in order to focus on near or distant objects. (Option c)

• The human eye lens is a convex lens that is flexible.
• It adjusts with the help of ciliary muscles for proper vision.
• The lens turns thin and thick so as to focus light onto the retina.
• It is the ciliary muscles that make it possible for the lens to change its shape according to the requirement.
• While focussing on a faraway object the eye lens turns thinner and it becomes thicker while focussing on nearby objects.