g′=g(1−hR)g^{\prime}=g\left(1-\frac{h}{R}\right)g′=g(1−Rh)
g′=g(RR−h)g^{\prime}=g\left(\frac{R}{R-h}\right)g′=g(R−hR)
g′=g(R−hR)2g^{\prime}=g\left(\frac{R-h}{R}\right)^{2}g′=g(RR−h)2
g′=g(R−h)\mathrm{g}^{\prime}=\mathrm{g}(\mathrm{R}-\mathrm{h})g′=g(R−h)
g′=g(R+h)\mathrm{g}^{\prime}=\mathrm{g}(\mathrm{R}+\mathrm{h})g′=g(R+h)