Q. 274.5( 13 Votes )

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?

Answer :

Power and focal length of a lens are related to each other by the following relation:


P = 1/ f


Where P is the power of lens


f is the focal length of the lens and should be in m.


The lens having high power or small focal length will have more converging power. So, the lens to obtain more convergent light is of focal length 20 cm.


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