Radiation is focused to an unhealthy area in a patient’s body using a parabolic reflector, positioned in such a way that the target area is at the focus. If the reflector is 30 cm wide and 15 cm deep at the center, how far should the base of the reflector be from the target area?

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Q: If a parabolic reflector is 40 cm in diameter and 5 cm deep, find the focus

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