# Refractive index of air is 1.0003. The correct thickness of air column which will have one more wavelength of yellow light (6000 Å) than in the sa

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Refractive index of air is 1.0003. The correct thickness of air column which will have one more wavelength of yellow light (6000 Å) than in the same thickness in vacuum is
A. 2mm
B. 2cm
C. 2m
D. 2km

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Correct Answer - A
Let x: number of wavelengths in vacuum
(x+1): number of wavelengths in air
x=(t)/(6000) ….(i)
x+1=(t)/((6000//1.0003)) …(ii)
(ii)-(i)
1=(1.003-1)(t)/(6000)
t=(6000)/(0.003)Å=(6xx10^7)/(3)Å=2xx10^-3m=2mm

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