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How are power and focal length of a lens...

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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The power of a lens is related to its focal length as `P=1/f`(in m).
More the power of a lens more is its converging power. Thus, the lens of shorter focal length will have more converging power.
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