If f_combined = 45.0 cm and f_glass = 30.0 cm, what is the focal length of the liquid layer (f_liquid)? - OPTICS Quiz | GKFix.in

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Question

If f_combined = 45.0 cm and f_glass = 30.0 cm, what is the focal length of the liquid layer (f_liquid)?

A. 90.0 cm
B. 45.0 cm
C. 30.0 cm
D. -90.0 cm