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

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Pupil

Retina

Ciliary muscles

Iris

answer is C.

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Detailed Solution

The action of the ciliary muscles causes a change in the focal length of an eye lens.
The human eye enables us to see this wonderful and colourful world. The image formed by the retina of the eyes is real and inverted, which is then sent to the brain with the help of optic nerves and then finally, we can see the objects around us, the ciliary muscles control the eye lens and changes its shape, and as a result, its focal length gets changed due to which we can see objects located at varying distances.

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