The image seen in a plane mirror is located
A. at the surface of the mirror
B. behind the mirror
C. in front of the mirror
D. at the position of the object
The correct answer and explanation is :
The correct answer is B. behind the mirror.
Explanation (300 words):
When you look into a plane mirror, the image you see appears to be located behind the mirror. This is because of the way light behaves when it reflects off the mirror’s surface.
A plane mirror reflects light following the law of reflection, which states that the angle of incidence equals the angle of reflection. The light rays coming from an object strike the mirror and reflect back toward your eyes. However, your brain interprets light as traveling in straight lines. As a result, your brain traces the reflected rays backward in a straight line behind the mirror. These backward-extended rays seem to meet at a point behind the mirror where the image forms. Thus, you perceive the image as being located behind the mirror, even though no light actually comes from there — it is a virtual image.
A virtual image differs from a real image because it cannot be projected onto a screen; it only exists from the viewer’s perspective. In a plane mirror, the virtual image is the same size as the object, upright (not inverted), and located at the same distance behind the mirror as the object is in front of it. For example, if you stand 2 meters in front of a mirror, your image appears 2 meters behind the mirror.
Importantly, the image is laterally inverted — left and right are swapped. This explains why writing appears reversed when seen in a mirror.
In summary, due to the straight-line assumption your brain makes when processing light and the behavior of reflected rays, the image formed by a plane mirror appears behind the mirror, not on its surface or in front of it.