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  4. The power of lens used by a short-sighted person is -2 D. Find the maximum distance of an object, which he can see without spectacles

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Q. The power of lens used by a short-sighted person is -2 D. Find the maximum distance of an object, which he can see without spectacles

Rajasthan PMTRajasthan PMT 2009

Solution:

$ P=-2D $ Focal length of the lens $ (f)=\frac{1}{P} $ $ =\frac{1}{-2}m=-\frac{100}{2}cm $ Therefore, person can see up to distance $ 50cm $ .