[" A slab of glass of thickness "6bar(cm)" and index "1.5" is "],[" place somewhere in between a concave mirror and "],[" a point object,perpendicular to the mirror's optical "],[" axis: The radius of curvature of the mirror is "],[40cm" .If the reflected final image coincides with "],[" the object,then find the distance of the object from "],[" the mirror? "]