Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is $3 \times 10^8 m s ^{-1}$.
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Refractive index of a medium, $n _{ m }=$ Speed of light in vacuum/Speed of light in the medium
Speed of light in vacuum, $c =3 \times 10^8 ms^{-1}$
Refractive index of glass, $n _{ g }=1.50$
Speed of light in the glass, $v=$ Speed of light in vacuum/ Refractive index of glass
$=c / ng_{g}$
$=3 \times 10^8 / 1.50=2 \times 10^8 m^{s-1}$
Speed of light in vacuum, $c =3 \times 10^8 ms^{-1}$
Refractive index of glass, $n _{ g }=1.50$
Speed of light in the glass, $v=$ Speed of light in vacuum/ Refractive index of glass
$=c / ng_{g}$
$=3 \times 10^8 / 1.50=2 \times 10^8 m^{s-1}$
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