Suppose that a large black hole forms two images of a background source separated by an angle

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Suppose that a large black hole forms two images of a background source separated by an angle θ. Let the fluxes of the two images be F+ and F < F+. Show that the flux from the source would be F+ − F if there were no lens and that the black hole should be located an angular distance [1+ (F/F+)1/2]−1θ along the line from the brighter image to the fainter one. 

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