Question

When we enter a dark room coming from outside, immediately the things inside the room do not appear clear to our eyes. This is because
i) pupils do not open at all in the dark.
ii) pupils take time to adjust.
iii) light travels slower in a dark room.
iv) pupils open very quickly in the dark.

Answer 1

Answer:

option 3. pupils take time to adjust

Answer 2

When we 'enter a dark room coming from outside', immediately the things inside the room do not appear 'clear to our eyes'. This is because 'pupils take time to adjust'.  

Option (ii)

Explanation:

• The pupils in our eyes act as an aperture in the camera. The pupil controls the amount of light entering in our eyes. The visual cells of the eye are called 'rods and cones'.
• These cells convert the light energy into electrical energy. In the time of the light condition the chemical reaction of the rod is reduced and the pupil also in the restricted form and when we enter in the darkroom so the 'pupil' takes some time to dilate to enter more light in the eye.  

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