What is the time taken to cross a glass of thickness 4 mm and μ = 3 by light ?
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Refractive index: the ratio of the velocity of light in a vacuum to its velocity in a specified medium.
μ = c / v
= c / (x/t) ……[∵ Speed = Distance / Time]
= ct/x
t = μx / c
= (3 × 4 × 10^-3 m) / (3 × 10^8 m/s)
= 4.0 × 10^-11 second
= 0.04 nanosecond
μ = c / v
= c / (x/t) ……[∵ Speed = Distance / Time]
= ct/x
t = μx / c
= (3 × 4 × 10^-3 m) / (3 × 10^8 m/s)
= 4.0 × 10^-11 second
= 0.04 nanosecond
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