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Physics

How does the power of a lens change if its focal length is doubled?

Refraction Lens

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Answer

As we know that,

P=1fP = \dfrac{1}{f}

Where,

P = power of lens and

f = focal length of lens.

Hence, power of a lens is inversely proportional to its focal length.

P=12fP = \dfrac{1}{2f}

So, if the focal length is doubled, the power gets halved.

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