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Cutting of Thin Lenses

A convex lens...

Question

A convex lens is of focal length $25 c m$ . Calculate the power of the lens.

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Solution

Power of lens $= \frac{1}{Focal length (in metre)}$

$= \frac{100}{Focal length (in centimetre)}$

$= \frac{100}{25} = 4 D$

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