Question

You must have seen dish antenna at your
homes, why the shape of that antenna
is always concave not convex?​

Answer 1

Dish antennas are concave in shape so as to increase the amount of incident EM wave energy on the antenna. This is done by keeping the receiver at the focal point of the spherical surface where em-waves converge at one point.

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#Hope it helps u... ●︿●