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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
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terminology - What exactly is focal length when there is also flange focal distance? - Photography Stack Exchange
Focal length, focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
What is Focal Length in Photography?
