Philip P. answered • 07/08/18
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A concave mirror will form a real image of the sun in the focal plane. A convex mirror forms a virtual image of the sun. In a real image, the refracted rays pass though the image point. In a virtual image, the rays only appear to pass though the image point, but they actually do not. So if you want to concentrate that sunlight on a point, use a concave mirror and real image.
Philip P.
Both the concave lens and concave mirror will form a real image at its focal point. That's why you can build a telescope with either a main lens or mirror. In the lens, the focal point is on the opposite side of the lens from the sun, while the sun and focal point are on the same side for the mirror. If you just wanted to burn a piece of paper on the ground, I'd choose the lens.
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07/12/18
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07/09/18