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Q.

What is the S.I. unit of power of a lens?

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a

Ampere

b

Dioptre

c

Meter

d

Joules

answer is A.

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Detailed Solution

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The reciprocal of a lens's focal length is known as its power. The letter P is used to symbolize it. 


P=1f gives the power P of a lens (in Dioptre) with a focal length of f (in m). 

"Dioptre" is the SI unit for a lens's power.

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