From the information provided, let us com-
pute the air gap (flatness error) values at A an
B in Figure 5 below. There are 9 bands at A.
No Response Required
Each band represents a distance of /2 or 11.6
micro inches for orange light. Using the formu-
la of foldout-10, you calculate the air gap to
be ________ micro inches (at the widest point).
(Turn to page 48.)
Figure 5. Air gap (flatness error) comparisons.
When you compare the number of bands at A
with the number at B in foldout-12, you realize
that the gap between the optical flat surface
and the surface of the piece-measured is _______
at B than it is at A (at the widest point).
You can determine the type of slope being
examined by tilting one ______ of the _________
flat as at B, or pressing on the _______ of the
optical _______ as at E in foldout-13.
From a close inspection of the bands at D
and E you will understand why the number of in-
terference bands at E has ______ . The decrease
in the number of bands was due to the __________
in the ________ of the air gap.
In foldout-14, 2 inches is the ____________
from the ______ ______ of one block to the lead-
ing edge of the other, and 1 inch is the _______
of the _________ block.