Question

Q 3 a. A doctor shines a bright torch into a patient's eye. What change does the doctor observe?
b. If two images are flashed in front of our eyes within a time less than one sixteenth of a second, we
are not able to distinguish between the two. What is this effect known as?

Answer 1

Answer:

When intense light rays reach your eye, the iris responds by constricting the pupil, thus protecting the retina and helping it process the incoming image better. The opposite occurs in low light when the iris dilates the pupil to allow as much light in as possible.

Explanation:

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