In a vacuum (void of molecules), light travels at 3.0 x 10 8 m/s, Light travels at different speeds in different materials or mediums. while in water. - ppt download
How to calculate the speed of light in a material of a known refractive index - YouTube
25.3: The Law of Refraction - Physics LibreTexts
Calculate the speed of light in a medium whose critical angle is 45^@.
State the laws of refraction of light. If the speed of light in vacuum is 3 X108 m/s, find the absolute refractive index of a medium in which light travels with a