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Eye Mechanism

How does the ...

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

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Solution

Answer: (c) The lens becomes thicker or thinner
In order to focus on near and distant objects, the lens of the eye is changed to focus the light rays from the object on the retina.
The thickness and shape of the lens are changed by the Ciliary muscles that help in focusing on objects at different distances. The lens gets thinner to focus on distant objects and vice versa.

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Similar questions

Which of the following is not a part of the human eye?

(a) the lens moves in or out

(b) the retina moves in or out

(c) the lens becomes thicker or thinner

(d) the pupil becomes larger or smaller

Q. The ciliary muscles in an eye change the focal length of an eye lens to focus distant or nearby objects clearly, this ability of an eye is known as the power of an eye.

Q. Which of the following changes occur when you walk out of bright sunshine into a poorly lit room ?
(a) the pupil becomes larger (b) the lens becomes thicker
(c) the ciliary muscle relaxes (d) the pupil becomes smaller

Q. What changes take place in the shape of eye-lens :
(a) when the eye is focused on a near object ?
(b) when the eye is focused on a distant object ?

Q. Question 13
The focal length of the eye lens increases when eye muscles

(a) are relaxed and lens becomes thinner
(b) contract and lens becomes thicker
(c) are relaxed and lens becomes thicker
(d) contract and lens becomes thinner

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