The idiomatic expression "to bounce off" means to rebound or reflect back, often used in reference to an action or idea that is not well received by someone. Full definition
Let's face it, all eyes are on you when you have light bouncing off of you. (thefashionspot.com.au)
Because the screens are made up of multiple layers of glass and plastic they actually produce multiple reflections from light bouncing off each of the different layers. (displaymate.com)
For example, sound bouncing off walls of a tunnel, and returning to their source. (sciencenewsforstudents.org)