In a well-lit room, Naledi is standing with her back against a wall, facing towards the center of the room. Opposite her, across the room, Jamal is holding a large flat mirror so that it is parallel to the wall Naledi is leaning against. What can Naledi see in the mirror?

Respond very briefly.
Naledi can see her own reflection in the mirror because the light reflecting off of her travels across the room, strikes the flat mirror Jamal is holding, and is reflected directly back towards her. Since the mirror is parallel to the wall she is leaning against, the angle of incidence (the angle at which the light hits the mirror) is equal to the angle of reflection (the angle at which the light leaves the mirror). This means that the light rays from Naledi that hit the mirror bounce back along the same path and thus, she can see her own reflection.