Abstract
We present an update of the “refractive index of air” experiment, which is commonly used in undergraduate advanced laboratories. The refractive index of air depends on the average molecular polarizability, which can be determined from the period of the phase shift in a Michelson interferometer as a function of air pressure. The measured average molecular polarizability of air is γmol=(2.118±0.091)×10−29 m3 (95% CI). The corresponding refractive index of air at atmospheric pressure is n=1.000265(11), which agrees with the accepted value of n=1.000271375(6).
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