The correct option is
A Air
Speed of light:
The value for the speed of light in a vacuum is now defined exactly as .
Explanation:
- Light waves travel fastest through the air, and slower through other materials such as glass or water.
- Speed of light in a medium of refractive index is given by:
, or Hence, for more , should be less.
speed of light in the medium, = speed of light in vacuum - Among the given options, the refractive index of air is less.
- Hence, the light will travel faster in the air.
Thus, the correct option is option A.