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Astrophysics - Resolving Power

Q: The original dish design of the Lovell Radio Telescope at Jodrell Bank used a 50 mm open wire mesh. Estimate the minimum wavelength detectable using this design.

I don't understand how to answer this question. I have seen a question like this before and the answer both divide by 20. lambda/20=0.05 is what the mark scheme suggests however this makes no sense to me.

Help appreciated
That's not a resolving power question afaict - that'd be concerned with the aperture size of the dish.

At long wavelengths e.g. 'Medium Wave' radio broadcasts ~200m the mesh would behave like a solid reflector
at short wavelengths e.g. visible light ~500nm the mesh would be nearly transparent

between those extremes you'd have to decide how much of the signal you could afford to lose before the signal you're trying to receive was overpowered by detector noise

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