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?

31.4 mm²

Explanation:

Light gathering power of any telescope or eye can be defined by the formula,

Here, d is the diameter of the pupil.

Now for bright daylight the typical size or diameter of the pupil is 3 mm.

Now for dark situation the typical size or diameter of the pupil is 7 mm.

Increase in light gathering power.

Therefore the more light which can gather by eye is 31.4 mm² .

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