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Question
The power of a lens is ______.
Options
directly proportional to its focal length in centimetres
inversely proportional to its focal length in centimetres
inversely proportional to its focal length in metres
directly proportional to its focal length in metres.
MCQ
Fill in the Blanks
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Solution
The power of a lens is inversely proportional to its focal length in metres.
Explanation:
The power of a lens is the reciprocal of its focal length in metres:
$$\text{P} = \dfrac{1}{f}$$
So power increases when focal length decreases.
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