Gravitational Lense - Focal Point & Mass-Radius Formula

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Gravitational lenses do have a focal point, similar to traditional lenses, but their focal point is more complex due to the uneven distribution of mass. The challenge lies in formulating a precise equation that relates the mass of the gravitational lens to the radius of its focal horizon. The irregular nature of gravitational lensing complicates the development of a uniform formula. Despite these challenges, there is interest in finding a mathematical description for these phenomena. The discussion indicates that some participants believe they have found relevant information regarding this topic.
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Does a gravitational lense have a focal point, like a nomal lense but as a focal point sphere/horizon. if so is there a formula that relates the mass of the GL with the radius of its focal horizon. Happy xmas.
 
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I would imagine it does, but no-one has bothered to make a formula to describe it seeing as gravitational lensing isn't caused by a nice uniform lense, but by an uneven body of mass, so it would be very difficult to describe the exact effect in a formula.
 
Thx for reply, i think i have found what i was looking for
 

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