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Virbhadra–Ellis lens equation

From Wikipedia, the free encyclopedia

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The Virbhadra-Ellis lens equation [1] in astronomy and mathematics relates to the angular positions of an unlensed source , the image , the Einstein bending angle of light , and the angular diameter lens-source and observer-source distances.

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This approximate lens equation is useful for studying the gravitational lens in strong and weak gravitational fields when the angular source position is small.

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