Medical Technology A lithotripter is a device that breaks up kidney stones by propagating shock waves through water in a chamber that has an elliptical cross-section. High-frequency shock waves are produced at one focus, and the patient is positioned in such a way that the kidney stones are at the other focus. On striking a point on the boundary of the chamber, the shock waves are reflected to the other focus and break up the kidney stones. Find the coordinates of the foci if the center of the e