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Moving Object, Stationary Lens

Two lenses of...

Question

Two lenses of power $25 D$ and $- 15 D$ are in contact with each other. Focal length of the combination will be

A

100 cm

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B

10 cm

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C

80 cm

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D

15 cm

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Solution

The correct option is B 10 cm
$P = P_{1} + P_{2} = 25 - 15 = 10$
$f = \frac{1}{P} = \frac{1}{10} = 0.1 m = 10 cm$

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