Question

Guys, what is a michelson interferometer?

Answer 1

Basically, it is made of a semi-reflective slab that produces two beams, each one reflecting on a mirror.

The beams recombine and interfere when they meet the semi-reflective slab again.

The real interferometer is a bit more complicated, but works the same way.

By moving the mirrors relative to one another, you can produce interferences as if coming from 2 point sources on an axis parallel to the screen or perpendicular to it.
In the first case, you obtain rectilinear fringes, in the second case, you obtain rings.

What is great with this interferometer, is that you do not need an actual point source at the beginning (no hole or slit), so the interference pattern will be much more intense.