It stays the same color. Electromagnetic waves simply travel slower through glass than through air. V lead cn lead 299792458 x 10 8 ms 26 12 x 10 8 ms 26 x 10 8 miles per hour.
Physics Calculate the refractive index of the material of a glass slab.
The tendency of a ray of light to bend one direction or another is dependent upon whether the light wave speeds up or slows down upon crossing the boundary. V cn where c is the speed of light in a vacuum. Refraction of Light through a Glass Block. Violet travels the slowest so it is on the bottom and red travels the fastest so is on the top.