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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? - CBSE Class 10 - Science

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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? 

Solution

A communications satellite sends a parallel beam of signals down to the Earth. If these signals are to be focussed onto a small receiving aerial, then the best shape of the metal dish that can be used to collect them would be concave. The metal dish will behave like a concave mirror, which is a converging mirror.

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Solution 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? Concept: Reflection of Light - Image Formation by Spherical Mirrors - Concave Mirror.
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