1
2
The optical flat below is described as a
______ disk which is not square but ______ . The
No Response Necessary
disk is transparent for __________ vision.
9
expansion
9.9
linear
1.65
(Turn to page 49.)
Figure 1. An optical flat.
16
transparent
17
Now, just a word about the physical dimen-
low
sions of optical flats. In the lists below, a
linear
few optical flat ________ and their correspond-
expansion
ing _______ values are compared. From the com-
perfectly
parisons made, you can reason that an optical
flat
flat is cut with a predetermined ____________
which is proportional to its ___________ .
23
monochromatic
Thicknesses
surface
2
inch
5/8
inch
3
inch
6/8
inch
4
inch
7/8
inch
5
inch
8/8
or 1 inch
(Turn to page 49.)
30
light
31
If the monochromatic light used has only
waves
one _______ or _______ , interference will occur
interference
at half wavelengths of the color used.
bands
37
greater
38
Because the air gap at B in Figure 4 is
interference
smaller than the air gap at A, the number of
bands
interference bands is ________ and the bands
smaller (lower or
are spaced ________ apart. These bands (at B)
decreased)
are ________ than the bands at A.
47
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