Because the image is not real. The object is not really there, it's only virtual.
the ray that passes from the object, when gets reflected from the plane mirror,the imaginary ray that passes from the mirror meets at a point behind mirror but the original do not meet actually.so the image formed by plane mirror is virtual.
The image is virtual and appears to be as much behind the mirror as the distance a person is away from the mirror.
the image is right-left reversed and about as far away from the mirror as the reflected object
An image is a copy of an object fromed by reflected (or refracted) rays of light.
convex mirror
MIRROR
the ray that passes from the object, when gets reflected from the plane mirror,the imaginary ray that passes from the mirror meets at a point behind mirror but the original do not meet actually.so the image formed by plane mirror is virtual.
The image is virtual and appears to be as much behind the mirror as the distance a person is away from the mirror.
The image is reflected from a reflective object, in this case [your mirror], as a Book is not a mirror, it is not reflected.
by a mirror
The way light is reflected is different in a concave mirror depending on the position and distance from the object. when light hits the concave mirror when it is near the object, the rays are scattered and it forms a virtual image, i.e it does not come on the screen. the image will be erect and higly magnified. When it is taken further from the object, the image becomes inverted and real, i.e it can be seen on a screen, and will still be magnified.
the image is right-left reversed and about as far away from the mirror as the reflected object
A concave mirror.
image distance is the distance from the point of incidence on the mirror, the where the image is reflected to.object distance is the distance from the actual object being reflected to the point of incidence on the mirror where it's reflected as an image.
An image is a copy of an object fromed by reflected (or refracted) rays of light.
a plane mirror (flat)
convex mirror