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Validity of the paraxial approximation in the focal region of a small-f-number lens

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Abstract

For small-f-number lenses, whereas the paraxial approximation cannot be used for a description of propagation of light from the lens to the focal region, it is shown that the approximation is still valid for propagation of light over relatively small distances in the region near the focus.

© 2001 Optical Society of America

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