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Q1: The combined effect of curvature and refraction over a distance L kilometres is

A 67.2 L2 mm

B 76.3 L2 mm

C 64.5 L2 mm

D none of these.

ANS:A - 67.2 L2 mm

Curvature correction = 0.0785D^2.
Refraction correction= 0.0785D^2÷7 = 0.0112D^2.
Combined correction = (0.0785-0.0112)D^2 =0.0672D^2.



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