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If a system of two thin lenses, one is a converging lense L1 with focal distance...

If a system of two thin lenses, one is a converging lense L1 with focal distance of f and the other is a diverging lens L2 with focal distance of -5f/8. They are separated by a distance of f/2

The question is to find the principal planes of the system by ray tracing and calculations and the equivalent focal length. My question is what is the meaning of equivalent focal length , represents what distance?I know what is the focal length of one lens, but I dont get what represents in the entire system. The same goes the principal planes, I know what they are in a thick lens, but in a system I have a hard time understanding.

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