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Lens Maker's Formula

The focal len...

Question

The focal length of a convex lens is $25 c m$ . Its power will be:

A

4

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B

5

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C

6

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D

10

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Solution

The correct option is A $4$
The power of the lense is,
$P = \frac{100}{f (c m)} = \frac{100}{25} = 4 D$

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