ICSE Class 10 Physics 2014 Solved Paper

Question : 40 of 66

Marks: +1, -0

The lens mentioned in 6(b) above is of focal length

25 {\cm}

. Calculate the power of the lens.

Solution:

Given :

f=25 {\cm}=0.25 {\m}

Power of lens (in D)

\;=\;{1}/{\;\text " Focal length (in metre) "\;}

\;=\;{1}/{0. 25}=\;{100}/{25}=4 {\D} .

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