7
expansion
8
In Lesson 1 we talked about the temperature
coefficients for gage block materials and linear
degree
expansions due to heat. Optical flat materials
also have temperature coefficients and are sub-
ject to ________ _________ due to heat.
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14
mating
15
The mating surface of an optical flat must
be ground as near perfectly flat as possible
surface
because the optical flat measurement will be
most accurate when the surfaces are_____ _______
flat
_________ .
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21
Lesson 2
Part II
thickness
(or)
OPTICAL FLAT APPLICATIONS
thicknesses
diameter
(CONTINUED ON PAGE 45)
28
in
29
If both of the mating ________ are perfectly
phase
____________and parallel to each other, the re-
flected light ______ will be _____ _________ .
If the surfaces are not perfectly flat, the re-
flected light waves will be ______ ____ _______ .
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35
36
Look at Figure 4. You see more ___________
bands
________ at A than at B because the air gap be-
out
tween the __________ and _______ ____________
of
mating surfaces is wider at A than at B.
phase
Figure 4.
Comparison of air gap widths.
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59
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