The all light rays with an angle of incidence greater than 48.8° will be totally internally reflect.
Critical angle:
It is the greatest angle of incidence at which refraction can still occur above this value the incidenting rays, completete internal refection occur.
Total internal reflection:
This phenomena occur when a an insident ray reflect back to the medium instead of refraction to another medium.
Therefore, the all light rays with an angle of incidence greater than 48.8° will be totally internally reflect.
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