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Q.

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 vacuum  t=nλ . . . (i) For air μt=n+1λ. . . .(ii) From equations (i) and (ii) t=λμ-1=6×10-71.0003-1 =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