Extracorporeal shock wave lithotripsy is a procedure that uses shockwaves to fragment kidney stones without the need

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Extracorporeal shock wave lithotripsy is a procedure that uses shockwaves to fragment kidney stones without the need for surgery. Using an elliptical reflector, a shock wave generator is placed at one focus and the kidney stone is positioned at the other focus. Shock waves pass through a water column and disintegrate the stone, allowing it to be passed out of the body naturally. If the equation of the ellipse formed by the reflector isimage

how far from the kidney stone does the shock wave generator need to be placed? (Units are in centimeters.)

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