The _______________ regulates directly the amount of light that enters the eye.
 |
lens; |
 |
fovea; |
 |
pupil; |
 |
iris; |
 |
both c and d are correct; |
INCORRECT - The lens does not directly regulate the amount of light entering the eye, but focuses images on the retina via the process of accommodation. The aging process may cause cataracts or clouding of the lens, thereby affecting light entry.
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