Answer to Question #95469 in Optics for Kikelomo

Question

The receiver for a dish antenna is placed in front of the concave surface of the dish. If the radius of curvature of the dish is R, how far in front of the dish should the receiver be placed? Explain.

Answer 1

The receiver should be placed in the focus of the concave mirror, i.e. at a distance of

$F=\frac{R}{2}$