What is the formula for overall magnification of pneumatic comparator? (Where, λ 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*λ/La
• B. 0.7*λ/La
• C. 0.4*λ*La
• D. 0.4*λ/Lab) 0.7*λ/Lac) 0.4*λ*Lad) 0.7*λ*La