A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm

A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. What is the power of the combination?
(a) -1.5D
(b) +1.5D
(c) +6.5 D
(d) -6.5 D

Anurag Mishra Professor Asked on 29th February 2016 in Physics.
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    Answer: (a) – 1.5 D

    Anurag Mishra Professor Answered on 2nd March 2016.
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