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Question 1
Define 1 dioptre of power of a lens.

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Solution

A dioptre is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres (i.e., 1/metres). It is thus a unit of reciprocal length. In other words,1 dioptre is defined as the power of a lens of focal length 1 metre.


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