Through which of the following will a light wave travel the fastest

a. air
b. outer space
c. water
d. glass wall

The light will have the fastest velocity when it travels through air or vacuum.

Option A

Explanation:

Light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water. In air, light waves travel fast because here the refraction phenomenon, light bending cannot be explained by the fact that light travels in different materials at changing speeds. But, it can be clearly seen in the case of glass or water.

Light's velocity (vacuum and air) = 273,400 mph or 300 million m/s.

Light’s velocity (water) = 205,600 mph or 226 million m/s.

Light's velocity (glass) = 182,300 mph or 200 million m/s.