As the angle of incidence is increased, the reflected light becomes brighter and rises in refrangibility.
It corresponds in refrangibility with the yellow band of the spectrum.
It was simply so lowered in refrangibility as to escape the visual range.
The principle that the refrangibility of light is altered by end-on motion was enunciated by Christian Doppler of Prague in 1842.
This confirmed his previous conclusion that the rays increase in refrangibility from red to violet.
This is an illustration of what is called the aberration of refrangibility.
Here, by the interposition of the platinum foil, the refrangibility of the ultra-red rays is so exalted as to render them visible.
Light of one degree of refrangibility—that corresponding to this particular green—is emitted by the thallium-vapour.