Give the MKS units for the following quantities.
Power of lens.

hertz

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Dioptre.

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ohms

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unit less

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Solution

The correct option is A Dioptre.
The dioptre is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in meters, or $D = \frac{1}{f}$ , where $D$ is the power in diopters and $f$ is the focal length in meters.

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