Geometrical Optics

Two transparent media having refractive indices 1.0 and 1.5 are separated by a spherical refracting surface of radius of curvature \(30 \mathrm{~cm}\). The centre of curvature of surface is towards denser medium and a point object is placed on the principle axis in rarer medium at a distance of \(15 \mathrm{~cm}\) from the pole of the surface. The distance of image from the pole of the surface is ____________ \(\mathrm{cm}\).