What is the formula for overall magnification of pneumatic comparator? (Where, is the length of scale of pressure measuring device and La is the average separation between nozzle surface and surface to be gauged)

What is the formula for overall magnification of pneumatic comparator?

1.	What is the formula for overall magnification of pneumatic comparator? (Where, is the length of scale of pressure measuring device and La is the average separation between nozzle surface and surface to be gauged)
A.	0.4* /L<sub>a</sub>
B.	0.7* /L<sub>a</sub>
C.	0.4* *L<sub>a</sub>
D.	0.7* *L<sub>a</sub>
Answer» B. 0.7* /L<sub>a</sub>