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

0.1 D

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10 D

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15 D

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20 D

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Solution

The correct option is B 10 D
Focal length of the lens $f = 10$ cm $= 0.1$ m
Power of lens $P = \frac{1}{f}$
$∴$ $P = \frac{1}{0.1} = 10$ $D$

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

The correct option is B 10 DFocal length of the lens f=10 cm =0.1 mPower of lens P=1f∴ P=10.1=10 D

The correct option is B 10 D
Focal length of the lens $f = 10$ cm $= 0.1$ m
Power of lens $P = \frac{1}{f}$
$∴$ $P = \frac{1}{0.1} = 10$ $D$