Answer :
When you enter a darkened cinema hall, it becomes difficult to see your surroundings clearly due to the process of dark adaptation. Dark adaptation is the adjustment of the eyes to low light conditions.
In a dark environment, the pupils of your eyes dilate to allow more light to enter. This dilation increases the sensitivity of the retina to capture the available light. However, it takes some time for the eyes to fully adapt to the darkness and for the visual system to adjust. When you enter a cinema hall, which is intentionally kept dark to enhance the movie-watching experience, your eyes are still adapting to the low light levels. Initially, the surroundings appear dark and indistinct because the visual system is still in the process of adjusting.
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