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Q.

The difference in the number of wavelengths is one, when yellow light propagates through air and vacuum columns of same thickness. The thickness of air column is (refractive index of air = 1.0003 and wavelength of light in vacuum = 60000 A) 

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a

1.8mm

b

2 mm

c

2.2 cm 

d

2 cm

answer is B.

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Detailed Solution

Δn=μaλair −μvλvt;1=(1.0003−1)6000×10−10tt=2mm

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