= Angle of incidence (optics)
{wiki=Angle_of_incidence_(optics)}
The angle of incidence in optics refers to the angle formed between an incident ray and the normal to the surface at the point where the ray strikes the surface. The normal is an imaginary line that is perpendicular to the surface at the point of contact. In mathematical terms, if a ray of light is coming in at a certain angle relative to this normal line, that angle is defined as the angle of incidence (typically denoted as \\( \\theta_i \\)).
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