This is called total internal reflection (TIR). The angle of incidence when the angle of refraction is 90 o, and the ray changes from just refracting to total internal reflection, is called the ...

the angles of internal and external conical refraction assume very high values. These angles in naphthalene, for example, are both about 13° 45′, which may be compared with 1° 54′ and 1° 44 ...

Name the process happening to the ray at the point X. There is no light emerging from the prism at Y. Name the process happening to the light at Y. How does the speed of light change, if at all ...