An eye specialist prescribes spectacles having a combination of convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power of this lens combination in diopters is
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a
+ 1.5
b
– 1.5
c
+ 6.67
d
– 6.67
answer is B.
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Detailed Solution
Power of convex lens P1=10040=2.5D Power of concave lens P2=−10025=−4D Now P=P1+P2=2.5D−4D=−1.5D