Index of refraction is defined as the speed of light in a vacuum divided by the speed of light in the medium.
Index of refraction can be expressed as:
, where η is the index of refraction, c is the speed of light in a vacuum, v is the speed of light in the medium, λo is the wavelength of light in vacuum, and λm is the wavelength of light in the medium.
The index of refraction for flint glass is 1.5. This means that
a. the speed of light is slower in this substance than it is in vacuum.
b. light travels faster in this substance than it does in vacuum.
c. the wavelength of light passing through glass is 1.5 x longer as it is in vacuum
d. a ray of light is refracted away from the normal as it passes from air into glass.
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