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Focal length, focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
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What Is Focal Length in Photography?
What Is Focal Length in Photography?
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The human eye
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Zoom lens - Wikipedia
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Focal length - Wikipedia
Focal Length | Understanding Camera Zoom & Lens Focal Length | Nikon | Nikon
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History of photographic lens design - Wikipedia
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