Lateral inversion
Explanation
Image formation by a plane mirror is governed by the laws of reflection. The image formed is virtual, erect, and of the same size as the object, but it undergoes a specific geometric reversal known as lateral inversion.- Dispersion is Incorrect: Dispersion is the phenomenon of splitting white light into its constituent component colors (spectrum) when it passes through a medium like a glass prism. It is caused by the dependence of the refractive index on the wavelength of light.
- Lateral inversion is Correct: Lateral inversion describes the phenomenon where the left side of an object appears as the right side in the mirror image, and vice versa. This occurs because the image is formed at the same distance behind the mirror as the object is in front, preserving depth but reversing lateral orientation relative to the observer.
- Diffused reflection is Incorrect: Diffused reflection (or irregular reflection) occurs when parallel rays of light fall on a rough or irregular surface and are reflected in different directions. This phenomenon enables the visibility of non-luminous objects from various angles but does not relate to image reversal.
- Refraction is Incorrect: Refraction is the bending of a light ray as it passes from one transparent medium to another of different optical density. It is distinct from reflection and does not cause the left-right reversal seen in mirrors.
Key Takeaway: Lateral inversion is the specific optical phenomenon in plane mirrors where the horizontal orientation of the image is reversed (left becomes right) relative to the object.