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Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
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A divergent lens has a focal length of 30 cm. At what distance should an object of height 5 cm from the optical centre of the lens be placed so that its
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What is Focal Length in Photography? - Focal Length Explained
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What Is Focal Length in Photography?
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Define focal length.
What is Focal Length in Photography? - Focal Length Explained
