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How is the Amount of Light Entering the Eye Controlled?

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Question

How is the amount of light entering the eye controlled?

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Solution

The amount of light entering the eye is controlled by changing the radius of the pupil. The pupil changes its radius with the help of the iris, which allows it to either expand or contract according to the intensity of light.

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Chapter 3: The Human Eyes And The Colorful World - Exercise 1 [Page 149]

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Lakhmir Singh Physics Part 1 [English] Class 10
Chapter 3 The Human Eyes And The Colorful World
Exercise 1 | Q 30. | Page 149
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