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Power and Thin Lenses in Contact

Power of a le...

Question

Power of a lens is $- 4$ D and for second lens power is $+ 2$ D; the total power of the couple.

A

- 2

D

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B

6

D

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C

- 6

D

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D

- 8

D

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Solution

The correct option is A $- 2$ D
Total power
$P = P_{1} + P_{2}$
$P = - 4 D + 2 D$
$P = - 2 D$ .

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