What do you mean by power of a lens???? state its SI unit??

1.	What do you mean by power of a lens???? state its SI unit??
Answer» Answer: The SI unit of power is dioptre (D) which is the inverse of the FOCAL LENGTH written in METRE (m). ... This means that the lens is a convex lens since a convex lens has a POSITIVE focal length. If the power of a lens is negative, from FORMULA (1), it inherently means that the focal length of the lens is negative.

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Answer:

The SI unit of power is dioptre (D) which is the inverse of the FOCAL LENGTH written in METRE (m). ... This means that the lens is a convex lens since a convex lens has a POSITIVE focal length. If the power of a lens is negative, from FORMULA (1), it inherently means that the focal length of the lens is negative.

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What do you mean by power of a lens???? state its SI unit??​

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What do you mean by power of a lens???? state its SI unit??