Olympus POS Buku Petunjuk - Halaman 6
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Test Plates
The test plates comprise a 1/4 ,vave length plate (mica 147mf1) and tint plate (gypsum 530 mf1).
These plates, which are used for checking the double refraction and distortion
of the specimen and
axial characteristics, are inserted in a slit on the right side of the tube.
tint
plate
114
w ave
length
plate
Analyzer
The analyzer can be slid out of the optical path, either to the right or to the left.
Moreover,
it
rotates through 90° (1 div. = 5°) by means of a rotatjng lever.
At 0°, the oscillation
is latitudinal.
In other words. at 00 the polarizer and analyzer are crossed Nicols.
Bertrand
Lens
The Bertrand
lens can be slid in and out of the optical path by means of the 90" rotatable
handle attached to the middlepart
of the tube.
When the lens is in the optical path, the mark on the
handle points upward.
In this case, the interference
image,
or conoscopic image, formed
on
the rear focal plane of the objective ]ens can bc observed through the center of the eyepiece since
the ]enses have a]readv been centered.
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