The refractive index of media A, B, C and D are , , and respectively. In which of these will the light travel b. slowest?
1. The refractive index of a medium is defined as the ratio of the speed of light in air to the speed of light in that medium .
Mathematically,
2. Light travels slower in a medium having a higher refractive index.
3. Among given media, medium C has the highest refractive index hence light travels slowest in medium C.