Question

WHAT IS NORMAL ON PLANE SURFACE

Answer 1

The line drawn perpendicular to the surface of the mirror is known as normal to the surface.

Answer 2

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In geometry, a normal is an object such as a line, ray, or vector that is perpendicular to a given object. In three dimensions, a surface normal, or simply normal, to a surface at point P is a vector perpendicular to the tangent plane of the surface at P.

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