Mirrors are very smooth and shiny. Light bounces, or reflects, off of the smooth and shiny surface of mirrors. When you see your face in a mirror you are seeing light from your face reflecting off of the mirror.
Light bounces off mirrors very much like a bouncing ball.
You can throw a ball straight down, and it will bounce straight back at you. Or you can bounce a ball at an angle and it will bounce off the floor at the same angle away from you. Light reflects the same way off a mirror. Light reflects from a mirror at the same angle as it arrives. You need to work with a partner to do this activity.