If the focal length of a convex lens is 50 cm, which one of the follow

1.	If the focal length of a convex lens is 50 cm, which one of the following is its power?
A.	+2 dioptre
B.	+0.02 dioptre
C.	-0.5 dioptre
D.	+0.5 dioptre
Answer» B. +0.02 dioptre

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If the focal length of a convex lens is 50 cm, which one of the following is its power?

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