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How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm

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How are power and focal length of a lens related? You are provided with two lenses of focal length 20 cm and 40 cm respectively. Which lens will you use to obtain more convergent light?

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P=1/f , P∝1/f. Power of a lens is inversely proportional to its focal length therefore lens having focal length of 20 cm will provide more convergence.

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