Refractive index of air is 1.0003. The correct thickness of air column which will have one more wavelength of yellow light (6000 Ao) than in the same thickness in vacuum is
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a
2 mm
b
2 cm
c
2 m
d
2 km
answer is A.
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Detailed Solution
For vacuume t=nλ0. . . (i) For air t=n+1λ. . . .(ii) From equations (i) and (ii) t=λμ-1=6×10-71.0003-1μ=λ0λ0 =2×10-3m=2 mm
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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 Ao) than in the same thickness in vacuum is