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

• A. The iris is unable to dilate the pupil immediately SOUND
• B. The iris is unable to contract the pupil immediately
• C. The eye muscles cannot immediately change the focal length of the eye lens
• D. The retina retains the bright images for some time and becomes momentarily insensitive

Correct Answer: A