Astrophysics uses wave optics or geometrical optics?

[Christian Grey]

I know Astrophysics uses concepts like relativity etc. But I want to know does it uses wave optics or geometrical optics? The phenomenon of light,wave optics(reflection,refraction,polarization,diffraction and interference) that we see everyday, is used in Astrophysics? Or does it uses geometrical optics(which only includes reflection and refraction) ?

 

[Dr. Courtney]

Most fields use both ray optics and wave optics depending on context.