Question

The power of a lens is . Define its principal focus and calculate its focal length.

Answer 1

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Answer 2

The power P of a lens is defined to be the inverse of its focal length. In equation form, this is P=1f P = 1 f , where f is the focal length of the lens, which must be given in meters (and not cm or mm). The power of a lens P has the unit diopters (D), provided that the focal length is given in meters.

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