What is the unit of power of a lens? Define it.

1.	What is the unit of power of a lens? Define it.
Answer» The unit of power of a lens is the dioptre (D). One dioptre is the power of a lens whose focal length is one metre. 1 dioptre (D) = \(\frac{1}{1\,metre\,(m)}\) [Note: The dioptre, the SI unit of power of a lens, is denoted by D.]

Answer»

The unit of power of a lens is the dioptre (D). One dioptre is the power of a lens whose focal length is one metre.

1 dioptre (D) = \(\frac{1}{1\,metre\,(m)}\)

[Note: The dioptre, the SI unit of power of a lens, is denoted by D.]

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