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Question

The focal length of a concave lens is 2m. Calculate the power of the lens.

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Solution

Power of lens (P) = 1f
Here, focal length, f=2m
Therefore, P=12
i.e., Power of the lens, P=0.5 dioptre
The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in metres, or P=1f, where P is the power in diopters and f is the focal length in metres.

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