For example, mathematical physics, which seems to be another imaging method of flat mirror? What's this imaging called? ask the way
Plane mirror usually changes the direction of light propagation according to the law of reflection, that is to say, the reflection of plane mirror changes the direction of light propagation. The light that should have converged to F' changes direction after being reflected by the plane mirror, and actually converges to point F. According to the reflection imaging law of the plane mirror, the virtual image F' of F is obtained in the mirror.