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

1. Pupil
2. Retina
3. Ciliary muscles
4. Iriss

Correct answer: Ciliary muscles

Solution

Ciliary muscles contract and relax to change the curvature of the eye lens, which changes its focal length. This process is called accommodation and helps focus images on the retina.

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