Question

When we enter a cinema hall, we cannot see properly for a short time. This is because?
A) Pupil does not open
B) Pupil does not close
C) Adjustment of pupil takes some time
D) None

Answer 1

Hint : When we are seeing any object in sunlight, the pupil eventually becomes small because it doesn’t allow too much light entering the eyes as somehow or the other it can cause problems in eyesight.

Complete Step by step solution:
The light outside the cinema hall is more than the light inside the cinema hall. When we enter a cinema hall we are not able to see properly for a short time because our iris is smaller because there is more light outside the cinema hall. Our iris need time to settle down after entering the cinema hall so it cannot be seen for a short time.
Hence, pupils take some time to adjust with the change in light.

Thus, option C is correct.

Additional Information: The pupil is the part of your eye that controls how much light goes in. In bright light, your pupils become smaller (narrower) to limit the amount of light. In the dark, your disciples grow (thin). This allows more illumination, which improves night vision. This causes an adjustment period when you enter a dark room. This is also the reason why your eyes are slightly sensitive after your eye doctor dilutes them on your bright day. Pupil constriction and dilation are involuntary reflexes. When a doctor lights up your eyes after an injury or illness, it is to see if your pupils are reacting normally to the light. In the cinema hall, the pupil stays small too as it cannot adjust to the sudden darkness.

Note: The pupil and the iris are the two most important parts of an eye. They control how much light should enter the eyes. It’s size is controlled by the muscles within the iris where one of the muscles constricts the opening of the pupil making it smaller whereas the other muscle dilates the pupil making it larger.