It looks to me like you’re tacitly assuming genuinely pointlike sources and targets when you say “that radiation would hit the target”, but then going back and reversing that assumption when you say the source would radiate more. The surface of the source is not exactly at the focal point, and so radiation from it does not necessarily pass exactly through the other focal point.
It looks to me like you’re tacitly assuming genuinely pointlike sources and targets when you say “that radiation would hit the target”, but then going back and reversing that assumption when you say the source would radiate more. The surface of the source is not exactly at the focal point, and so radiation from it does not necessarily pass exactly through the other focal point.
OHHHHHHHH...… I get it. Thank you.