Question: Expression for effective radius factor k in terms of radius of curvature rc and radius of earth re?
Options
A : k=\frac{1}{1-\frac{r_c}{r_e}}
B : k=\frac{1}{1-\frac{r_e}{r_c}}
C : k= 1-\frac{r_e}{r_c}
D : k= 1-\frac{r_c}{r_e}
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