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Which of the following statement is true?
A convex lens has 4D power having a focal length 0.25 m
A convex lens has 4D power having a focal length -0.25 m
A concave lens has 4D power having a focal length 0.25 m
A concave lens has 4D power having a focal length -0.25 m
The power P of a lens of focal length f is given by P = 1/f, where f is the focal length in metre and P is the power in dioptre. P= 1/f or f = 1/P = 1/4 = 0.25 m
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