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## Main Question or Discussion Point

Did not know how to word this properly.

Looking for an equation to show the behaviour of how EM can be "lensed" as a function of wavelength/frequency.

ie RF waves can not be lensed/focussed to a spot.

what equation determines the minimum spot size a lens can focus EM radiation as a function of frequency?

Looking for an equation to show the behaviour of how EM can be "lensed" as a function of wavelength/frequency.

ie RF waves can not be lensed/focussed to a spot.

what equation determines the minimum spot size a lens can focus EM radiation as a function of frequency?