Give an MKS unit for the power of the lens.

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Meter

Dioptre

Weber

Mete

r^{2}

answer is B.

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Detailed Solution

Concept: The mathematical relationship between the lens's power and the problem at hand can be solved. The power of the lens is inversely proportional to the focal length, increasing as the focal length decreases and vice versa. The power of the lens is determined by the focal length of the lens.
Dioptre determines the lens's power in its MKS unit. The dioptre is the measurement unit often used to determine the lens's refractive power. Additionally, the lens' mathematical power is calculated by taking the reciprocal of the lens' focal length.
The relation is,

P = \frac{1}{f}

Here, P stands for the lens's power and f stands for the focal length in meters. And the basic unit known as the dioptre is obtained by taking the reciprocal of the meter.
As a result, the power of the lens is expressed in terms of dioptre in the MKS unit.
Hence, option 2 is the correct answer.

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