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Human Eye

How does the ...

Question

How does the focal length of the eye lens change when we shift looking a distance object to a nearby object.

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Solution

The focal length of our eye lens will decrease if we want see a nearer object rather than a distant object.

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Fill in the blanks:

For a human eye lens, for nearby objects, focal length ____ while for far away objects focal length ____ .

Q. Change in focal length of an eye-lens to focus the image of the object at varying distances is done by the action of:

Ciliary muscles are responsible for changing the focal length of the eye lens according to the distance of the object.

Q. The ciliary muscles can change the focal length of the eye lens. Find the ratio of focal lengths of the eye lens when it is focused on two different objects, one at a distance of 2 m and the other at a distance of 1m. The diameter of normal eye is 2.5 cm.

Q. The maximum focal length of the eye-lens of a person is greater than its distance from the retina. The eye is
(a) always strained in looking at an object
(b) strained for objects at large distances only
(c) strained for objects at short distances only
(d) unstrained for all distances

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