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

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An eye specialist prescribes spectacles having combination of convex lens of focal length 40cm in contact with a concave lens of focal length 25cm. The power of this lens combination in diopters is
A. `+ 1.5`
B. `- 1.5`
C. `+ 6.67`
D. `- 6.67`
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Correct Answer - b
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