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Lenses physics question?

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Your prescription for new eyeglasses is -4.50D. What will their focal length be?

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  1. The D refers to diopters. A diopter is the recipricol of the focal length in meters (1/f).

    Thus a -4.50D lens has a focal length of

    1 / (-4.5) = -0.22 meters.

    That is 0.22 meters behind the lens (diverging lens).

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