Why does it take some time to see objects in a cinema hall when we just enter the hall from bright sunlight? Explain in brief.

(N/A) The pupil of the eye regulates and controls the amount of light entering the eye.
In bright sunlight,the iris causes the pupil to contract,making its size small to limit light entry.
When we enter a dark cinema hall,the amount of light is significantly lower.
It takes some time for the iris to relax and the pupil to expand in size to allow more light to enter the eye so that we can see objects clearly in the dim light.