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 ?

Lens with focal length 20 cm

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Lens with focal length 40 cm

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Both lenses will converge light equally

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Data insufficiant

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Solution

The correct option is A Lens with focal length 20 cm
$P = \frac{1}{f}, P \propto \frac{1}{f}$

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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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 ?

The correct option is A Lens with focal length 20 cmP=1f,P∝1fPower of a lens is inversely proportional to its focal length therefore lens having focal length of 20 cm will provide more convergence.

The correct option is A Lens with focal length 20 cm
$P = \frac{1}{f}, P \propto \frac{1}{f}$

Power of a lens is inversely proportional to its focal length therefore lens having focal length of 20 cm will provide more convergence.