An apparatus is described for the measurement of the group velocity of light in transparent media. The apparatus uses a modified He–Ne laser as a stable, amplitude‐modulated light source. With the aid of a single beam oscilloscope, results for the velocity of light in air accurate to ∼0.02% have been obtained. This accuracy is sufficient to enable the relationship between the group and phase velocities in transparent dispersive media to be experimentally verified.
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© 1990 American Association of Physics Teachers.
1990
American Association of Physics Teachers
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