Final answer:
When light reflects off a medium, it follows the law of reflection, which states that the angle of incidence is equal to the angle of reflection.
Step-by-step explanation:
Physics
When light reflects off a medium, it follows the law of reflection, which states that the angle of incidence (the angle at which light strikes the surface) is equal to the angle of reflection (the angle at which light bounces off the surface).
Therefore, if light hits a mirror at a 40-degree angle, it will bounce off at a 40-degree angle as well.
This can be demonstrated with a simple diagram:
[diagram showing light hitting a mirror at a 40-degree angle and reflecting off at the same angle]