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Caution Fill in all input cells. Choose all parameters unit. Except zx which is algebraic, all input parameters are positive. Positive direction is according to the sense of the horizontal arrow provided for this purpose.. It is assumed that the combination of lenses working in the YZ plane is an afocal system and that the waist of the incident beam is in the front focal plane of the first lens of this afocal system. Consequently, the waist of the refracted beam is in the back focal plane of the second lens of the afocal system.