The absolute refractive index of water is 1.36. What is the velocity of light in water ? (velocity of light in vacuum 3×10⁸ m/s)
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Refractive index of glass is defined as the ratio of the speed of light in vacuum to the speed of light in glass.
Refractive index of glass, n
g
=
Speed of light in glass
Speed of light in vacuum
Therefore, n
g
=
2×10
8
3×10
8
=
2
3
.
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