This is the reflected ray. Put an arrow on it to show its direction. The law of reflection states that: angle of incidence i = angle of reflection r. For example, if a light ray hits a surface ...

Total internal reflection close total internal reflectionWhen the angle of incidence in the dense medium is greater than the critical angle, all the light is reflected and none is refracted.

Schematic of a grazing incidence small and wide angle X-ray scattering (GISAXS/GIWAXS) experimental setup showing the incident (αi) and the scattered angles along the horizontal (2θf) and vertical (αf ...