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Mirrors

Starting a fire with a mirror and sunlight.

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?

Image formed by a concave mirror

For an image formed by a concave mirror to be a point, the object must be: A) between the principle focus and the mirror B) at the center of curvature C) at an infinite distance D) at the principle focus