1.

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

Answer» Power(P)=`1/("Focal length (m)")`
Given,P=-2D
`therefore` Focal length=`-1/2=0.5mrArrF=-50 cm`
Hence, maximum distance of an object, which he can see without spectacles is 50 cm.


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