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A communicati...

Question

A communications satellite in orbit sends a parallel beam of signals down to earth. If these signals obey the same laws of reflection as light and are to be focussed onto a small receiving aerial, what should be the best shape of the metal 'dish' used to collect them ?

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Solution

A concave metal dish would be the best option. It will collect the parallel beam of satellite signals at its focus where receiving aerial is fixed.

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