Answer-
Because diamond has a refractive index of 2.42, the speed of light in it is reduced by a factor of 2.42 when compared to the speed of light in air.
To put it another way, the speed of light in a diamond is 1/2.42 that of light in vacuum.
The refractive index of diamond is 2.42. What is the meaning of this statement?
The refractive index of diamond is 2.42. What is the meaning of this statement?