Collage based on Drude 1902, p. 122:  Equation for the group velocity of light in a nonvacuum medium.

The Pulfrich Effect: Lit (1960)

Lit, A. Magnitude of the Pulfrich stereophenomenon as a function of target velocity. Journal of Experimental Psychology, 1960, 59(3), 165 - 175.

Copyright (c) 1960, by Alfred Lit. Permission of the author [and the publisher] is granted to make (download) a single copy of this work, and/or its abstract, for personal, noncommercial use. All other rights are reserved.
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The Pulfrich Effect, SIU-C. Last updated 2000-07-23