Conservation Of Radiance
In
telecommunication
, a
conservation of radiance
is a basic principle of optics, that no passive optical
system
can increase the quantity
L
/
n
2
, where
L
is the
radiance
of a
beam
and
n
is the local
refractive index
.
Note:
"Conservation of radiance"
was formerly called
"conservation of
brightness
"
or the
"brightness theorem."
Source:
From
Federal Standard 1037C
and from
MIL-STD-188
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