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f-number - Wikipedia
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f-number, light throughput, focal length, depth of field, working f-number
System Throughput, f/#, and Numerical Aperture | Edmund Optics
Focal length, focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
The value of the focal length of the lens is equal to the value of the image distance when rays are (A) Passing through optical center(B) Parallel to the principal axis.(C) Passing
