How many reflective curved surfaces to an acphrerical lens?

Question

I hope I have spelt It correctly.

Answer 1

Aspherical-not a sphere. A lens is not normally reflective,per se, so I suspect this is some sort of physics problem, and not a hobby project. Part of me wants to say there is no reflective, only refractive properties; the other part says the answer is infinite reflectivity, diffusion. I'll wait for more answerers...good luck.