Question

lateral inversion define and which mirror is lateral inversion​

Answer 1

Lateral inversion" means the apparent reversal of the mirror image's left and right when compared with the object. "Lateral" justmeans "sideways". 

If a person is reflected in a planemirror, the image of his right hand appears to be the left hand of the image.

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Answer 2

When an object is placed in front of a "plane mirror", then the right side of object appears to become the left side of image, and the left side of object appears to become the right side of image image. This change of sides of an object and its "mirror image" is called lateral inversion.