Which is the angle of incidence
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In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal.
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in geometric optic, the angel of incidence is the angel between the ray incident on a surface and the line perpendicular to the surface at the point the incidence, called the normal. the ray can be formed by any wave. optical, acoustic microwave,x-ray abd so on.
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