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A doctor advises a patient to use specta...

A doctor advises a patient to use spectacles with a convx lens of focal length 40 cm in contact with a concave lens of focal elnggth 25 cm.Wjhat is the power of the resultant combination?

A

1.5 D

B

`-1.5 D`

C

`6.5 D`

D

`-6.5 D`

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