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Which of the following is a wrong statem...

Which of the following is a wrong statement?

A

`D = 1//f` where f is the focal length and D is called the refractive power of a lens

B

Power is called a diopter when fis in metres.

C

Power is called a diopter and does not depend on the system of unit used to measure f

D

D is positive for convergent lens and negative for divergent lens

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The correct Answer is:
c
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