Q 2579734616.     An eye specialist prescribes spectacles to a patient. The spectacles is a combination of a convex lens of focal length `20 cm` and a concave lens of focal length `25 cm`. The power of this lens combination will be

BCECE 2015 Mains
A

`2 D`

B

`- 1.5 D`

C

`1 D`

D

`-1 D`

0
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