Normal is an imaginary straight line passing through the point of incidence and parallel to the flat boundary or to the tangent plane to the curved boundary at the point of incidence

Normal is an imaginary straight line passing through the point of incidence and perpendicular to the flat boundary or to the tangent plane to the curved boundary at the point of incidence

Normal is an imaginary straight line passing through the point of incidence and perpendicular to the flat boundary or to the tangent secant plane to the curved boundary at the point of incidence

Normal is an imaginary straight line passing through the point of incidence and perpendicular to the flat boundary or to the tangent plane to the flat boundary at the point of incidence

The point of incidence represents the point at which the incident ray meets the normal

The point of incidence represents the point at which the incident ray meets the normal at point of incidence

The point of incidence represents the point at which the incident ray meets the boundary

the angle of incidence equals the angle of reflection.

the angle of incidence equals the angle of refraction.

the plane of incidence equals the angle of reflection.