The power of a lens is -4.0D. what is the nature of the lens
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P=1\f
-4=1\f
f=-1\4
f= -0.25m
Therefore the lens is concave and the image is virtual.
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CONCAVE AND VIRTUAL
Explanation:
The power of the lens is in negative sign and is hence Concave
(note : if power of lens is negative then it is concave and if it is positive then it is a convex lens ! )
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