Question

history of spherical mirror in human civilization

Answer 1

OUR ANCESTORS USED CONCAVE MIRROR HAS A SOLAR COOKER APPARATUS BECAUSE WHEN THE LIGHT RADIATIONS FROM SUN COME PARRLEL TO THE PRINCIPAL AXIS THEY MERGE TOWARDS THE FOCUS SO THE WHOLE RADIATION IS FOCUSED AT THAT POINT SO THEY KEEP A DISH AT THAT POINT AND THEY START COOKING.WE USE CONVEX MIRROR AS REAR VIEW MIRROR AND TWO PLANE MIRRORS AT A TIME  FOR INFINITE IMAGES