Question

what is power of lense and what is it SI unit​

Answer 1

Answer:

Answer:If a lens has a shorter focal length it is said to be more powerful. The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D).

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Dioptre is the SI unit for measuring power of a lens.

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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 diopter. it is denoted by D. The power of the convex lens is positive and concave lens is negative.

Explanation:

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