A bi-convex lens has radius of curvature of both the surfaces same as\(1/6\mathrm{cm}\). If this lens is required to be …

A bi-convex lens has radius of curvature of both the surfaces same as\(1/6\mathrm{cm}\). If this lens is required to be replaced by another convex lens having different radii of curvatures on both sides \(\left({\mathrm{R}}_{1}\neq {\mathrm{R}}_{2}\right)\), without any change in lens power then possible combination of \({R}_{1}\) and \({R}_{2}\) is :