Question

How are the power and focal length of a lens related consider two lenses of focal length 20 cm and 40 cm respectively which lenses will you used to obtain more convergent light?

Answer 1

Which has less focal length

Answer 2

$\: \: \: \: \: \: \: \: \: \: \: \huge\fbox{\blue{\colorbox{orange}{\sf{Answer}}}}$

The power ( P ) and focal length ( f ) of a lens are related by the following equation :

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \large{\boxed{\bf{\green{P = \frac{1}{f} }}}}$

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

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