Two thin lenses of focal lengths, f1 and f2 are in contact and coaxial – InterviewSolution

1.	Two thin lenses of focal lengths, f1 and f2 are in contact and coaxial. The combination is equivalent to a single lens of power:
Answer» Two thin lenses of focal lengths, $f_{1}$ and $f_{2}$ are in contact and coaxial. The combination is equivalent to a single lens of power:

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