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LENSES and MIRRORS
LENSES and MIRRORS

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Lecture 21 Wave Optics

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... Due: February 11 (Friday COB) Instructions: Complete the following problems showing all work. Please write as legibly as possible. If your handwriting is a problem use a text editor. 1. a. Write down the lens equation. b. Under what condition is the focal length equal to z’ ( distance of image plane ...
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F-number



In optics, the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography. The number is commonly notated using a hooked f, i.e. f/N, where N is the f-number.
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