Question: No lens can focus light down to a perfect point because there will always be some diffraction. Estimate the size of the minimum spot of

No lens can focus light down to a perfect point because there will always be some diffraction. Estimate the size of the minimum spot of light that can be expected at the focus of a lens. Discuss the relationship among the focal length, the lens diameter, and the spot size. Take the ƒ-number of the lens to be roughly 0.8 or 0.9, which is just about what you can expect for a fast lens.

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