The following thin lenses are made of glass of index of refraction 1.6. Make a sketch of

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The following thin lenses are made of glass of index of refraction 1.6. Make a sketch of each lens, and find its focal length in air:

(a) r1 = 20 cm, r2 = 10 cm;

(b) r1 = 10 cm, r2 = 20 cm;

(c) r1 = –10 cm, r2 = –20 cm.

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