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[" 34.Two thin lenses of focal length "f...

[" 34.Two thin lenses of focal length "f_(1)" and "f_(2)" are in contact and coaxial.The power of the combination is "],[[" (A) "(f_(1)+f_(2))/(2)," (B) "(f_(1)+f_(2))/(f_(1)f_(2))," (C) "sqrt((f_(1))/(f_(2)))," (D) "sqrt((f_(2))/(f_(1)))]]

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