Question

How fast does the light travel in a glass refractive index of 1.5?
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Answer 1

the light travels at a velocity of
`2\,\,10^8 (m)/(s)` in the glass

Step-by-step explanation:

Recall that the refractive index of a material (n) is defined as the quotient between the speed of light in vacuum (c), and the speed of light in the medium (v). Therefore we can solve for the speed of light in the medium if we know the index of refraction it has:

`n=(c)/(v) \\v=(c)/(n) \\v=(3\,\,10^8)/(1.5) (m)/(s) \\v=2\,\,10^8 (m)/(s)`