Double Convex Lens Magnifing an Arrow

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“Double convex lenses are used in the eyeglasses for old people, becoming more spherical according to the age of the person or the magnifing power required.” -Comstock 1850

Source

J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 238

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