Why are pupils of the eye black?
In biology we learned that the pupil controls how much light hits the rods and cones. If it is an opening, why does it look black?
The pupils appear black because most light that enters the pupil is absorbed by the retina (the tissue in the back of the eye). Since the light is absorbed rather than reflected or refracted, it appears as if no light is exiting the pupils, making them look black.
Think of them as blackholes, light enters but doesn't escape.
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