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Power and Thin Lenses in Contact

Two thin lens...

Question

Two thin lenses are in contact and the focal length of the combination is $80 c m$ . If the focal length of one lens is $20 c m$ , then the power of the other lens will be

A

1.66 D

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B

4.00 D

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C

- 100 D

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D

- 3.75 D

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Solution

The correct option is D $- 3.75 D$
$P_{2} = P - P_{1} = \frac{100}{80} - \frac{100}{20} = - 3.75 D$

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