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Short Note

What is meant by a power of a lens? Define its SI unit.

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#### Solution 1

The power of a lens is defined as the reciprocal of its focal length. It is represented by the letter P. The power P of a lens of focal length f is given as

P = 1/f

The SI unit of power is dioptre (D).

#### Solution 2

Power of lens: Power of lens is defined as its ability to converge or diverge the rays of light falling on it. SI unit of power is Dioptre.

Concept: Power of a Lens

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