When you enter a dimly lit room from sunlight at noon. What is the change in the size of the pupil?
A. In the sunlight pupil contracts and entering a dim lighted room the size of pupil increases
B. In dim light size of the pupil decreases and in sunlight the pupil size increases
C. Both A and B can occur. It depends on the size of the eye
D. None of these

Hint:The understanding of the structure and working of the human eye is to be known. The eye is composed of various parts, including the iris, pupil, cornea, and retina. The eye has six muscles which control the eye development, all giving diverse pressure and force. The eye works a great deal like a camera, the pupil gives the f-stop, the iris the aperture stop, the cornea takes after a lens.

Complete answer:
 Muscles in the iris control your pupil size. Your pupils get greater or more modest, contingent upon the measure of light around you. In low light, your pupils open up or widen, to allow in more light. At the point when it's bright, they get more modest or tighten, to allow in less light.

In the sunlight, the size of your pupil decreases. In dim light the pupil gets enlarged letting more light into the eye. To be precise, in a dim lit room, our eye needs to absorb more light and hence the pupil expands or the size of the pupil increases.

Hence, the right answer is option A.

Note:The working and structure of the human eye is crucial to answer the question. When light enters your eye the muscles in our pupils adjust in a way such that the light can enter. In dim light, the muscles expand our pupils in order to let in more light so as to see better.