In water, it travels at 140000 miles/second, or 225000 km/second, in a vacuum it is 300,000,000 meters/second, not sure about a solid
What Is The Speed Of Light In Air, Water, And Solid?
The speed of light when no medium is present or in a vacuum is 3 x 108 meter per second. It is a universal constant and represented by 'c'. When the light passes through a medium, its speed becomes less. The average velocity of light through a medium depends on the refractive index of the medium. The formula for speed of light in a medium is;
v= c/n ('n' represents the refractive index of the medium)
The refractive index for vacuum is one so speed of light in vacuum is v=c. The refractive index for any other liquid and solids is greater than one so the speed of light in liquids and solids is less than 'c'.
v= c/n ('n' represents the refractive index of the medium)
The refractive index for vacuum is one so speed of light in vacuum is v=c. The refractive index for any other liquid and solids is greater than one so the speed of light in liquids and solids is less than 'c'.