The focal length of the human eye decreases when eye muscles [[1]] and lens become [[2]].

Subject; Physics

Topic; Atmospheric refraction

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Detailed Solution

The focal length of the human eye decreases when eye muscles expand and the lens becomes thicker.
The focal length of a human eye lens is affected by the change in the size of muscles and the thickness of the lens. So, when the size of muscles increases and the lens becomes thicker, the focal length of the lens decreases.

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