When a person walking in bright Sunlight enters a dark room he is not able to see clearly for a little while because

When a person walking in bright Sunlight enters a dark room he is not able to see clearly for a little while because
1). the eye muscles cannot immediately adjust the focal length of the eye lens.
2). the retina retains the bright images for sometime and becomes momentarily insensitive.
3). the iris is unable to contract the pupil immediately
4). the iris is unable to dilate the pupil immediately

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