Why is the image of a point in a flat mirror called imaginary?

An image in a flat mirror is called imaginary, because in reality there are no objects behind the mirror, rays from objects reflected in the mirror fall into our eyes, mentally continuing these reflected rays beyond the plane of the mirror, we get an imaginary image of objects.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.