Two thin lenses of focal length `f_(1)` and `f_(2)` are in contact and coaxial. The power of the combination isA. `f_(1)+f_(2)`B. `(f_(1)f_(2))/(f_(1)+f_(2))`C. `1/2 (f_(1)+f_(2))`D. `(f_(1)+f_(2))/(f_(1)f_(2))`

Two thin lenses of focal length `f_(1)` and `f_(2)` are in contact and

1.	Two thin lenses of focal length `f_(1)` and `f_(2)` are in contact and coaxial. The power of the combination isA. `f_(1)+f_(2)`B. `(f_(1)f_(2))/(f_(1)+f_(2))`C. `1/2 (f_(1)+f_(2))`D. `(f_(1)+f_(2))/(f_(1)f_(2))`
Answer» Correct Answer - d

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Two thin lenses of focal length `f_(1)` and `f_(2)` are in contact and coaxial. The power of the combination isA. `f_(1)+f_(2)`B. `(f_(1)f_(2))/(f_(1)+f_(2))`C. `1/2 (f_(1)+f_(2))`D. `(f_(1)+f_(2))/(f_(1)f_(2))`

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