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Statement of a problem № 41920

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Suppose that a luminous sphere of radius R1 (such as the Sun) is surrounded by a uniform atmosphere of radius R2 and index of refraction n. When the sphere is viewed from a location far away in vacuum, what is its apparent radius? You will need to distinguish between the two cases (a) R2 > nR1 and (b) R2 < nR1.




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