How much time will be.taken by the sunlight to pass through a window of thickness 4mm whose refractive index is 1.5?
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Refractive index is given by
n = c / v
= c / (x/t) ……[∵ speed = distance/time]
= ct/x
t = nx/c
= (1.5 × 4 × 10^-3 m) / (3 × 10^8 m/s)
= 2 × 10^-11 s
= 0.02 nanosecond
∴ Time taken is 0.02 nanosecond
n = c / v
= c / (x/t) ……[∵ speed = distance/time]
= ct/x
t = nx/c
= (1.5 × 4 × 10^-3 m) / (3 × 10^8 m/s)
= 2 × 10^-11 s
= 0.02 nanosecond
∴ Time taken is 0.02 nanosecond
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