How are power and focal length of a lens related ? You are provided with two lenses of focal length 20cm and 40 cm respectively . Which lens will you use to obtain more convergent light ?
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Power and focal length is related as P= 1/f.
More the power of a lens , more is its converging power. Thus , the lens of shorter focal length will have more converging power. Hence 20 cm is the correct answer.
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