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“A lens is a transparent body the two refracting surfaces of which are curved, or one of which is curved and the other plane.(1) Double convex(2) Plano convex(3) Meniscus(4)Double concave(5) Plano concave(6) Concavo concave.” -Avery 1895


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 357


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