the absolute refractive indices of glass and water are 4÷3 and 3÷2 respectively if the speed of light in glass is 2×10^8 m\s calculate the speed of light in vacuum and water
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Actually, ng = 3/2 and nw = 4/3.
Absolute Refractive Index of a medium = Speed of light in vacuum/Speed of light in the medium
Speed of light in glass = 2 x 108 m/s
Speed of Light in Vacuum = (3/2) x 2 x 108 m/s = 3 x 108 m/s
Speed of light in water = (3 x 108 m/s)/(4/3)
= 2.25 x 108 m/s
Absolute Refractive Index of a medium = Speed of light in vacuum/Speed of light in the medium
Speed of light in glass = 2 x 108 m/s
Speed of Light in Vacuum = (3/2) x 2 x 108 m/s = 3 x 108 m/s
Speed of light in water = (3 x 108 m/s)/(4/3)
= 2.25 x 108 m/s
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