what'are incident rays
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An incident ray is a ray of light that strikes a surface. The angle between this ray and the perpendicular or normal to the surface is the angle of incidence.
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Your kitchen light being on is incident upon you flipping the switch. And conversely, if you throw a ball onto a surface, that ball is incident upon the surface. You threw it and that led to it hitting the surface. This last usage is the one that is meant by incident ray.
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