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positive crystal
noun
(optics)
A
doubly
refracting
crystal
in
which
the
index
of
refraction
for
the
extraordinary
ray
is
greater
than
for
the
ordinary
ray,
and
the
former
is
refracted
nearer
to
the
axis
than
the
latter,
such
as
quartz
and
ice;
as
opposed
to
negative
crystal:
one
in
which
this
characteristic
is
reversed,
such
as
Iceland
spar
or
tourmaline.
positive degree
noun
positive
adj
positive
noun
positive zero
noun
positively
adv
false positive
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