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directbydirecct
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In the paper Strong field limit of black hole gravitational lensing, the amplification of images in the Schwartzschild metric was given by
$$
\frac{1}{\beta}\sqrt{\frac{2\,D_{LS}}{D_{OL}D_{OS}}}
$$However the authors did not derive this expression or explain its origin. Does anyone know how to derive this expression or knows where the author got it from?
Any help is appreciated.
Thanks in advance.
$$
\frac{1}{\beta}\sqrt{\frac{2\,D_{LS}}{D_{OL}D_{OS}}}
$$However the authors did not derive this expression or explain its origin. Does anyone know how to derive this expression or knows where the author got it from?
Any help is appreciated.
Thanks in advance.
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