Expression for effective radius factor k in terms of radius of curvature rc and radius of earth re?

(k= frac{1}{1- frac{r_c}{r_e}} )

(k= frac{1}{1- frac{r_e}{r_c}} )

Expression for effective radius factor k in terms of radius of curvatu

1.	Expression for effective radius factor k in terms of radius of curvature rc and radius of earth re?
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} )
Answer» C. (k= 1- frac{r_e}{r_c} )