A white light point source is placed along the optical axis of a convex lens at a distance of $0\mathrm{.}4$m from the lens. The refractive indices of the lens for red and blue light are $1\mathrm{.}52$ and $1\mathrm{.}54$ respectively. A real red image of the source is formed $0\mathrm{.}6$m away from the lens. What is the distance of the blue image from the lens?