In broad daylight, the size of your pupil is typically 3 mm. In dark situations, it expands to about 7 mm. How much more light can it gather?
Question
In broad daylight, the size of your pupil is typically 3 mm. In dark situations, it expands to about 7 mm. How much more light can it gather?
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Solution 1
The amount of light the eye can gather is proportional to the area of the pupil. The area of a circle (which the pupil is) is given by the formula πr², where r is the radius of the circle.
- First, we need to find the area of the pupil in both situations.
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