[Petrochemicals (OP)]

As in the title what if the slits are at a tangent or "T" arrangement ? I would guess 2 non interferance outers with one central band and 2 dark patches either side or similar, if it follows water theory.

Have any other arrangements of slits been tried ? Parralell rather than perpendicular perhaps  ? Hole and slit

[evan_au]

If the two slits were at 90 degrees to each other, and the light source were positioned so that the light struck each slit face-on, then you would need >45 degrees diffraction to get any interference at all.

Because light has a very short wavelength (compared to slits that can be easily constructed), the diffraction angle is mostly very small. That's why the slits have to be very close together to get a visible diffraction pattern.

So I am guessing that with this arrangement, there would be a theoretical diffraction pattern, but it in practice it would be too dim to detect.
It would just look like light shining through 2 slits at 90 degrees to each other.

[hamdani yusuf]

As in the title what if the slits are at a tangent or "T" arrangement ? I would guess 2 non interferance outers with one central band and 2 dark patches either side or similar, if it follows water theory.

Have any other arrangements of slits been tried ? Parralell rather than perpendicular perhaps  ? Hole and slit

You can see my experiment for horizontally tilted obstacle here

and my experiment for vertically tilted obstacle here

[evan_au]

The circular diffraction pattern was new to me, and very neat...

Back to the OP: In those videos, the light source was a green laser, which has a very narrow beamwidth.
If you had 2 slits at right angles to each other, and you illuminated one 1 slit perpendicularly, almost no light would go through the second slit.

A diffraction grating has a very different diffraction pattern than a slit - a grating produces light at a series of angles, where the grating spacing corresponds to multiples of the light wavelength. Some of these multiples can produce very wide angles of diffraction; with a slit, energy at large angles is very much lower.
See: https://en.wikipedia.org/wiki/Diffraction_grating

[Petrochemicals (OP)]

The circular diffraction pattern was new to me, and very neat...

Back to the OP: In those videos, the light source was a green laser, which has a very narrow beamwidth.
If you had 2 slits at right angles to each other, and you illuminated one 1 slit perpendicularly, almost no light would go through the second slit.

A diffraction grating has a very different diffraction pattern than a slit - a grating produces light at a series of angles, where the grating spacing corresponds to multiples of the light wavelength. Some of these multiples can produce very wide angles of diffraction; with a slit, energy at large angles is very much lower.
See: https://en.wikipedia.org/wiki/Diffraction_grating

As in polarisation ? That does not mean however that the slits would not interact though, part of the mystery. Fire a singular electron through the vertical, does the horizintal have an effect still?

[Petrochemicals (OP)]

As in the title what if the slits are at a tangent or "T" arrangement ? I would guess 2 non interferance outers with one central band and 2 dark patches either side or similar, if it follows water theory.

Have any other arrangements of slits been tried ? Parralell rather than perpendicular perhaps  ? Hole and slit

You can see my experiment for horizontally tilted obstacle here

and my experiment for vertically tilted obstacle here

Very interesting, that spread is along long way from a clear line of sight through the slit.