Quote:
Originally Posted by Hornblower
When light from a background object is bent by the gravitational field in the foreground, you are calling it gravitational lensing. When the light is emitted from the foreground object (within the "lens", so to speak), it seems to you that the subsequent bending is not gravitational lensing.
To me, that is quibbling with words.
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Does not seem like quibbling with words to me:
Quote:
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A gravitational lens is formed when the light from a very distant, bright source (such as a quasar) is "bent" around a massive object (such as a cluster of galaxies) between the source object and the observer. The process is known as gravitational lensing, and is one of the predictions of Albert Einstein's general theory of relativity.
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source: http://en.wikipedia.org/wiki/Gravitational_lensing
Otherwise, every stellar object would be seen as gravitational lensing.
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