How to simulate the reflection of a wave from a perfect convex or concave mirror

[zhiping0913]

I want to ask how to set a mirror.
I know I can use mp.Cylinder to set a shape like a convex mirror, but how about a concave mirror?
Also will the material material=mp.perfect_electric_conductor work for a mirror?

[stevengj]

First, if you have a system in the ray optics regime, with a radius of curvature much larger than the wavelength, then a fullwave simulation is probably overkill.

Second, you could use a perfect conductor in this regime to represent a perfectly reflective metal surface.

Third, you can make a circular concave mirror by starting with a block of solid metal and then putting an air cylinder on top of it to "chop a hole" out. (To make other shapes you could use a prism object or a material function.)