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Physics Question 36 – NEET-UG 2023

Two thin lenses are of same focal lengths (f), but one is convex and the other one is concave. When they are placed in contact with each other, the equivalent focal length of the combination will be :
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Ninja StrategyPower Cancellation

Recognize that a convex lens and a concave lens with the same focal length magnitude have equal and opposite optical powers, leading to a net power of zero for the combination, which corresponds to an infinite focal length.