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Q.

The power of a lens with a focal length of 25 cm will be:

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a

0.5D

b

10D

c

4D

d

25D

answer is C.

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Detailed Solution

detailed_solution_thumbnail

$Power = \frac{1}{f}$
$f = 25 cm = 0.25 m$
$Power = \frac{1}{0.25} = 4 D$
Therefore, the power of the lens will be 4D.

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