A High-accuracy Formula for Fast Evaluation of the Effect of Focal Shift
- 1 September 1991
- journal article
- research article
- Published by Taylor & Francis in Journal of Modern Optics
- Vol. 38 (9) , 1815-1819
- https://doi.org/10.1080/09500349114551921
Abstract
A simple formula for computing focal shifts in systems of different Fresnel numbers is proposed based on an analysis of factors that limit the extent of a focused field. This formula gives the focal shift accurately to about 2%, which is currently the best approximation that can be made.Keywords
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