# What is the formula for calculating the speed of light in glass?

March 28, 2021 | education

| The speed of light in glass can be calculated in different ways.

Most often, they use the formula that connects the speed of light in glass with its refractive index:

n = c / u

from here

u = c / n,

where c is the speed of light in vacuum,

n is the refractive index of light in glass.

Less often used are formulas connecting the wavelength, period and frequency of light in glass:

u = λ / T = λn,

where λ is the wavelength,

n is the vibration frequency of the light wave.

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