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In physics, the normal is a line perpendicular to a surface.
In physics, the normal is a line perpendicular to a surface. It is used for example in the study of light, as a reference to compare the angle at which a ray of light is refracted or reflected from a material.
It is used for example in the study of light, as a reference to compare the angle at which a ray of light is refracted or reflected from a material.