It is shown that by allowing for an effective mass increase in the corpuscular theory of light, the particle travels slower rather than faster on entering an optically denser medium. The viewpoint and results are consistent with the photon description. The method leads to an improved treatment of the Newtonian deflection of light in a gravitational field, and the relation of this deflection to the general relativistic deflection is considerably clarified. It is pointed out that the gravitational index of refraction and the electromagnetic index of refraction are not equivalent as regards the motion of charged particles.

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