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Starting a fire with a mirror and sunlight.

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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?

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https://brainmass.com/physics/mirrors/starting-a-fire-with-a-mirror-and-sunlight-16686

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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 ...

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