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. 2 cm
C. 2m
D. 2 km

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. 2 mm
B. 2 cm
C. 2m
D. 2 km