Which kind of spherical mirror, concave or convex, can be used to start a fire with sunlight? For the best results, how far from the mirror should the paper to be ignited be placed?© BrainMass Inc. brainmass.com August 15, 2018, 12:54 am ad1c9bdddf
You should use a concave spherical mirror. A paper should be placed at the vicinity of geometrical centre of the sphere.
Let's assume the sunrays to be a beam of parallel rays falling on a concave spherical mirror that is a ...