Create a surface that reflects other objects

Hello,
I'm a beginner with Unity and i'm searching to create (in 2d game) a surface that reflects others objects, for example a ball will bump in the opposite direction and will not loose energy.
Should i use a specific component (wich one ?) or create a script that trigger on collision event ?
Thank's in advance.

 

I was sure you're talking about mirror reflection.

I think setting drag & friction to 0 and min, bounciness to 1 and max should solve it no?

 

setting friction to 0 on the physic material of the box solved it thanks !