Question
Sun October 14, 2012 By: Tanushekha Agnihottri
 

Why are mirrors used in search lights parabolic and not concave spherical?

Expert Reply
Mon October 15, 2012
it is because the spherical mirrrors do not make the light coming from a sorce at their center completely parallel if the source is not exactly at the center.l While it is not so in the case of a parabolic mirror.
Tue February 07, 2017

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