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The power of a combination of two lenses...

The power of a combination of two lenses in contact is + 1.0 D. If the focal length of one of the lenses of the combination is + 20.0 cm, the focal length of the other lens would be:

A

`-120.0cm`

B

`+80.0cm`

C

`-25.0 cm`

D

`-20.0cm`

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