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  4. A converging lens has a focal length of 50 cm The power of the lens is:

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Q. A converging lens has a focal length of 50 cm The power of the lens is:

KEAMKEAM 2000

Solution:

Power of a lens is inverse of focal length (in metres) $ P=\frac{1}{f} $ Given, $ f=50\text{ }cm $ $ \therefore $ $ P=\frac{100}{50}=+2D $