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وارد شوید

Physics for IGCSE & O level - Rays And Waves (Section 5 - No. 14)

Which of the following is the best definition of the 'normal' line?
The reflected ray
The incident ray
A line perpendicular to the surface at the point of incidence
The line parallel to the surface

توضیح

The normal is a line perpendicular to the surface.

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