A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of combination is

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- 1.5 D

- 6.5 D

+ 6.5 D

+ 6.67 D

answer is A.

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Detailed Solution

Focal length of the combination can be calculated as⇒1F=1f1+1f2⇒1F=1+40+1−25⇒F=−2003 cm∴P=100F=100−200/3=−1.5 D

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