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An achromatic lens is formed from two thin lenses in contact, having powers of 10.0 diopters and -6.0 diopters. Determine the power and focal length of the combination. Since reciprocal focal lengths add, Power = 10.0-6.0= 4.0 diopters and Focal length =(1)/( Power )=(1)/( 4.0  m^-1)= 25  cm | Numerade
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