I’ll bet they tried all sorts of combo’s over the years. Interesting though....if diffractions off the edges of the slits themselves affect observable phenomena...changing diameters.
Camera apertures for example are fascinating studies. Depth of focus changes towards infinity(all things in the field of focus) or equal focal sharpness as the apertures get smaller(and more light exposure is needed for a proper picture) but unless the shutter blades are designed for it, there is a point that light rays will glint off the edges of the aperture blades causing diffractions and loss of focus. Obviously when the aperture blades close completely no light hits the sensor...but just at that point with good control of aperture design, all objects beyond minimal focus distance are in infinity focus having equal maximum sharpness.
I just wonder in their ‘slit’ experiments they account for the effects of light diffractions off the inner edges of the “slits”. Yes I’m familiar with what the various slits were supposed to do...a light beam gets split in a way that make it behave as a wave or a particle as the first split is sent through a slit and the twin beam is unaltered but is observed behaving in the same fashion as the altered beam. I’m curious if diffraction effects are also accounted for and if affects are seen in the unaltered beam as well. I guess I’ll never know.
good question