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What is meant by the power of a lens ? Give its SI unit. When two or more lenses are placed in contact what will be their combined power ?

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What is meant by the power of a lens ? Give its SI unit. When two or more lenses are placed in contact what will be their combined power ?
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The reciprocal of the {ocat length of a lens is termed as the power of the lens. It is expressed in meters.

Sl unit is dioptre.

The combined power will be equal to the algebraic the sum of their individual powers.

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