write about 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. ... In the figure below, the line representing a ray makes an angle θ with the normal (dotted line).
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when a light ray hits boundary of a medium the angle formed by the ray with the normal is called the incident re
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