Radiation is focused to an unhealthy area in a patient’s body using a semi-elliptic reflector, positioned in such a way that the target area is at one focus while the source of radiation is at the...

Radiation is focused to an unhealthy area in a patient’s body using a semi-elliptic reflector, positioned in such a way that the target area is at one focus while the source of radiation is at the other. If the reflector is 100 cm wide and 30 cm high at the center, how far should the radiation source and the target area be from the end of the reflector?