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## Homework Statement

Why is the depth of field greater, and the image sharper, when a camera lens is "stopped down" to a larger f-number? Ignore diffraction.

## Homework Equations

f-number=f/D where D is the diameter of the hole.

## The Attempt at a Solution

At a larger f-number, the diameter of the hole is smaller so there is less exposure, although I'm not sure what that has to do with the depth of field. Can someone help me?