What is the equivalent radius of the earth when the ray appears to be a straight line over a flat earth surface?(a) 0(b) Infinity(c) Actual radius(d) 4/3 times actual radiusThe question was posed to me at a job interview.My enquiry is from Radio Wave Propagation in portion Radio Wave Propagation of Antennas

What is the equivalent radius of the earth when the ray appears to be

1.	What is the equivalent radius of the earth when the ray appears to be a straight line over a flat earth surface?(a) 0(b) Infinity(c) Actual radius(d) 4/3 times actual radiusThe question was posed to me at a job interview.My enquiry is from Radio Wave Propagation in portion Radio Wave Propagation of Antennas
Answer» The correct option is (B) Infinity Explanation: When the ray APPEARS to be a straight line over a flat earth surface horizontally, its refractive INDEX is not CHANGING with respect to height. \(\frac{dM}{dh}=0\) Effective radius is k times the ACTUAL radius and \(k=0.048/\frac{dM}{dh}=∞\)

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