42

43

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).

50

104.4

(Turn to page 48.)

Figure 5. Air gap (flatness error) comparisons.

57

points (areas)

58

When you compare the number of bands at A

with the number at B in foldout-12, you realize

contact

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).

64

convex

65

You can determine the type of slope being

examined by tilting one ______ of the _________

concave

flat as at B, or pressing on the _______ of the

optical _______ as at E in foldout-13.

72

73

From a close inspection of the bands at D

and E you will understand why the number of in-

bands

terference bands at E has ______ . The decrease

in the number of bands was due to the __________

decrease

in the ________ of the air gap.

80

width

81

In foldout-14, 2 inches is the ____________

from the ______ ______ of one block to the lead-

distance

ing edge of the other, and 1 inch is the _______

of the _________ block.

edge

46

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