A communications satellite in its 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, a [[1]] is the best shape of the metal 'dish' used to collect them.

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

A communications satellite in its 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, a concave metal dish is the best shape of the metal 'dish' used to collect them.
It will collect the parallel beam of satellite signals at its focus where receiving aerial is fixed. The shape of the 'dish' should be like a concave mirror so that it can focus and collect all the rays of signal effectively. A concave mirror has a surface which is reflecting inwards and away from the light source. The image formed by a concave mirror shows different types of images depending on the distance between the object and the mirror. So here, we can use the Concave shape metal dish.

Watch 3-min video & get full concept clarity