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Thanks, Mark and Dave.
I was familiar with the theory and formulae but was more interested in the practical interpretation. I think you've answered some of my questions.
In the case of a close binary, the apparent distance between the stars increases with magnification. If the apparent size of the Airy disk also increases, I'm guessing the radius of detectable light within the Airy disk shrinks as the magnification increases. Hence, the reason we can separate the stars more easily.
Regards, Rob
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