If the power of a lens is - 4.0 D, then it means that the lens is a __

1.	If the power of a lens is - 4.0 D, then it means that the lens is a __________.
A.	concave lens of focal length -50 m
B.	convex lens of focal length +50 cm
C.	concave lens of focal length -25 cm
D.	convex lens of focal length -25 m
Answer» D. convex lens of focal length -25 m

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If the power of a lens is - 4.0 D, then it means that the lens is a __________.

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