Discussion
When one enters a dark room after being in bright light one is not able to see anything clearly for a while because
Answer: C
The iris cannot dilate the pupil quickly enough.
In bright light the pupil is constricted to a small aperture; on entering darkness the iris muscles need time to open it, and the retinal pigment rhodopsin, bleached by the bright light, takes several minutes to regenerate. Full dark adaptation takes about twenty to thirty minutes.
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