The _______________ regulates directly the amount of light that enters the eye.
 |
lens; |
 |
fovea; |
 |
pupil; |
 |
iris; |
 |
both c and d are correct; |
CORRECT - Yes, both the iris and pupil regulate the amount of light entering the eye. The iris is a muscle that changes the size of the pupil in response to environmental lighting and other conditions.
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