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  4. A focal length of a lens is 10 cm What is power of a lens in dioptre ?

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Q. A focal length of a lens is 10 cm What is power of a lens in dioptre ?

KCETKCET 2014Ray Optics and Optical Instruments

Solution:

Focal length of the lens $f =10 cm =0.1 m$
Power oflens $ P =\frac{1}{ f }$
$ \therefore P =\frac{1}{0.1}=10 D $