KCET 2005 Physics Solved Paper

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Question : 14 of 60

Marks: +1, -0

Which of the following is a wrong statement?

D=‌
1
f
where f is the focal length and D is called the refractive power of a lens.
Power is called a dioptre when f is in metres.
Power is called a diptre and does not depend on the system of unit used to measure f.
D is positive for convergent lens and negative for divergent lens.

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