ICSE Class 10 Physics 2018 Solved Paper

The power of a lens is $-5 D$ .

Question : 11 of 78

Marks: +1, -0

Find its focal length.

Solution:

Given:
Power of lens

=-5 {\D}

∴ \;\text " focal length "\;\;=\;{100}/{\;\text " Power "\;} \;\text " (in cm) "\;

\;=\;{100}/{-5}=-20 {\cm}

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