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Structure of Eye

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Question

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The eye lens can change its focal length due to working of _________ muscles.

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Solution

The eye lens can change its focal length due to working of $ciliary muscles$ .

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Q. Fill in the blanks
The maximum focal length of the eye lens is about _________.

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.

The change in focal length of an eye lens is caused by the action of the

(a) pupil

(b) retina

(c) ciliary muscles

(d) iris

Q. What is the working of ciliary muscles to change the focal length of a convex mirror in our eyes? Please explain in simple language?

Q. Assertion : If objective and eye lenses of a microscope are interchanged, it can work as a telescope.
Reason : The objective lens of a telescope has small focal length.

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