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Question

A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power ___ D.

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Solution

The power of a lens is defined as the reciprocal of focal length, P=1f.
Here, P=12 m=0.5D
The defect given in the question is short-sightedness, also called myopia. So, a concave lens must be used, therefore power should be –0.5 D.

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