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Power of a Lens

The focal len...

Question

The focal length of a convex lens is 25 cm. What is its power?

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Solution

Given, f = 25 cm
Power of a lens is given by:
Power (P) = $\frac{1}{f}$

∴ P = $\frac{1}{25 \times 10^{- 2}}$ = $\frac{100}{25}$ = 4 D.

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