Identify the option that arranges the speed of light in descending order in different mediums.

* The speed of light in a medium is inversely proportional to its refractive index (n), defined as v=
n
c
​
, where c is the speed of light in vacuum.

Refractive indices of given mediums are approximately:

Air: 1.0003≈1

Water: 1.33

Glass: 1.5

Diamond: 2.42

A higher refractive index means a lower speed of light. Therefore, the descending order of the speed of light is:

Air>Water>Glass>Diamond