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The pupil is the small opening in the eye through which light passes. Its size changes in response to varying light levels and emotional arousal. In low light, the pupil dilates (expands) to allow more light in, whereas in high light, it constricts (shrinks) to reduce light entry.

Pupil

Imagine you have just spent two hours in a completely dark movie theater. As you walk outside into the bright, sunny afternoon, what immediate change would you expect to happen to the small, dark openings in the center of your eyes, and why?

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