A convex lens of focal length 40 cm, a concave lens of focal length 40 cm and a concave lens of focal length 15 cm are placed in contact. The power of this combination in dioptres is

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+1.5

– 1.5

+ 6.67

– 6.67

answer is D.

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Detailed Solution

1f=1f1+1f2+1f3=140+1-40+1-15=-115 P=100f=100-15=-6.67D

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