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15/05/2021 1:46 pm
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Look into your friend’s eye. Observe the size of the pupil. Throw light on her eye with a torch. Observe the pupil now. Switch off the torch, and observe her pupil once again. Do you notice any change in the size of the pupil? In which case was the pupil larger? Why do you think it was so?
In which case do you need to allow more light in the eye, when the light is dim or bright?
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15/05/2021 1:47 pm
When the light from the torch falls on the pupil, its size becomes smaller to allow less amount of light to enter into the retina. When light is switched off, pupil enlarges to allow more light to enter into the retina. Thus, pupil controls the amount of light entering into the eye.