The critical angle is associated with refraction of light This angle is the smallest angle of incidence at which total internal reflection (TIR) occurs
The angle above which total internal reflection happens At angels lower than the critical angle, the light is refracted through the cladding
The minimum angle of incidence for which a light ray is totally reflected within a medium
When traveling from an optically denser to optically less dense material, the angle of incidence at which light stops being refracted and is totally reflected
In geometric optics, at a refractive boundary, the smallest angle of incidence at which total internal reflection occurs (188) Note 1: The angle of incidence is measured with respect to the normal at the refractive boundary Note 2: The critical angle is given by
(qc) - qc = sin-1 (n2/n1), where n2 and n1 are the refractive indices of two materials at the interface (n2 being of the higher refractive material)
That limiting angle of incidence in the optically denser medium that results in an angle of refraction of 90o
Applies when light strikes a boundary between two materials and the speed of light in the material that it is travelling in is less than the speed of light in the material beyond the boundary If the angle of incidence at the boundary is greater than the critical angle, all the light is reflected