If an object is placed in a medium of refractive index `mu_1` and refraction takes place through another medium of refractive index `mu_2` of radius of curvature `R_1,` then
`1/u + 1/V = 1/(2R)`
`1/u + 1/V = 2/R`
`mu_1/v + mu_2/u = (mu_2 - mu_1)/R`
`mu_1/u + mu_2/V = (mu_2 - mu_1)/R`