A ray of monochromatic (single-color), parallel light (plane wave) propagates a sinusoidal electromagnetic vibration whose amplitude is a function of time t :
A = a cos (2 π f t )
with :
a
:
complex amplitude
f
:
light frequency; this is independent of the nature of the medium in which the radiation propagates, as is the period T = 1/f.
The wavelength depends on the medium in...
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