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Power and Thin Lenses in Contact

Two lenses of...

Question

Two lenses of power 6D and -2D are placed in contact. The power of the combination will be

A

- 12 D

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B

+ 4 D

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C

- 4 D

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D

3 D

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Solution

The correct option is B $+ 4 D$
$P = P_{1} + P_{2}$
$= 6 D - 2 D$
$= 4 D$

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