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MathType on X: "The focal length for a positive converging lens in air is the distance from the lens to the point where the incident light beam is focused. It can be
Why is more refractive power of lens required to view near objects than distant objects from the eye? - Quora
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The Eye. Optics of Vision - The Nervous System: B. The Special Senses - Guyton and Hall Textbook of Medical Physiology, 12th Ed
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