PDF chapter test TRY NOW
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?
The pupil as a result of the torch's light falling on it, allowing light to reach the retina.
The pupil when the light is turned off to let light reach the retina.
The amount of light entering the eye is therefore by the pupil.
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