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Q. The change in focal length of an eye lens is caused by the action of the __:
Answer: ciliary muscle
Notes: Focal length increases as the lens on the eye is contracted or relaxed by the ciliary muscles is because of the ability of the eye to accommodate. The ability of the eye to change the focus between objects at different distances by altering the curvature of the lens is called accommodation.

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📌 Question Number: 109 in Physics GK 19 - Light and Human Eye in the above course in App.