A) \[D=1\text{ }/f\] where f is the focal length and D is called the refractive power of a lens.
B) Power is expressed in a diopter when f is in metres
C) Power is expressed in 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.
Correct Answer: C
Solution :
Fig. 1 represents the short-sightedness or myopia.
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