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a |
Our eyes are more sensitive
to red light, so it is
easier to see the light and
dark areas when there is a
red tint plate.
(Incorrect: human eyes are
most sensitive to the green
region of light.) |
|
b |
The red tint plate only lets
a small window of
wavelengths through, and so
increases the birefringence.
(Incorrect: the red tint
plate lets through all
visible wavelengths of
light.) |
|
c |
The red tint plate displaces
the ordinary and the
extraordinary beams by an
extra wavelength, so that
small differences in
birefringence cause large
differences in colour.
Correct! |
|
d |
The red tint plate increases
the differences in
birefringence in the
material so that the
different grain directions
cause a greater difference
in colour than in just the
polarised light.
(Incorrect: the tint plate
does not affect the
birefringence of the
material.) |
|
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