Question

Write a note on the power of a lens. State its SI unit. Also name the instrument used to measure the power of a lens.​

Answer 1

Answer:

The power of the lens is the reciprocal of the focal length of the lens. The SI unit of the power is diopter. it is denoted by D. The power of the convex lens is positive and concave lens is negative

Explanation:

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Answer 2

Answer:

The power of the lens is the reciprocal of the focal length of the lens. The SI unit of the power is dioptre. it is denoted by D. The power of the convex lens is positive and concave lens is negative

Explanation:

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(and the answer given above there dioptre spelling is wrong pls don't copy that)