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Can infinity be observed in the real world?
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[QUOTE="pixel, post: 5458097, member: 566143"] It is an approximation when anything larger will not make a difference at the precision level of interest. For instance, if we image a star with a lens, we can take the star to be an infinite distance away and the image at the focal plane of the lens. This should work for any star - there's no point distinguishing one star at 30 light years distance from another at 100 light years away. They're both "at infinity" so in the simple lens equation the 1/(object distance) term can be neglected. For another example, see my post #4 in this thread: [URL]https://www.physicsforums.com/threads/electric-field-due-to-a-charged-sheet.868788/#post-5454334[/URL] [/QUOTE]
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Can infinity be observed in the real world?
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