Q.

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
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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