Definition of Critical angle
(Optics)
that
angle
of
incidence
of
a
luminous
ray
at
which
it
is
wholly
reflected
,
and
no
portion
of
it
transmitted
.
The
sine
of
this
angle
is
the
reciprocal
of
the
refractive
index
of
the
medium
.
See also:
Critical
Related Words
angle
of
incidence
,
incidence
angle
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