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Problem on thermal radiation and lenses
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[QUOTE="haruspex, post: 6468250, member: 334404"] A ray arriving from a point at one edge of the sun, as observed from Earth, is not quite parallel with a ray from the opposite edge, so they will not focus at the same point. OTOH, rays from one point on the sun arriving at different points of the lens are effectively parallel, so do focus at the same point. As a result, an actual image of the sun is produced, spots and all. [/QUOTE]
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Introductory Physics Homework Help
Problem on thermal radiation and lenses
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