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  4. Convex lens of power 4D and a concave lens of power 3D are placed in contact. What is the equivalent power of the combination?

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Q. Convex lens of power 4D and a concave lens of power 3D are placed in contact. What is the equivalent power of the combination?

JIPMERJIPMER 1995

Solution:

Here: Power of convex lens = 4D Power of concave lens = 3D Hence, die equivalent power of the combination = 4D - 3D = 1D ( $ \because $ Concave lens has negative (minus) focal length, so its power will also be negative.)