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An eye specialist prescribes spectacles ...

An eye specialist prescribes spectacles having a combination of a convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power is this lens combination is

A

`-1.5` D

B

`-6.5` D

C

1.5 D

D

6.5 D

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The correct Answer is:
A
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