AP EAMCET Engineering 2018 Apr 22 Shift 2 Paper

As shown in the figure, a parallel beam of light incident on the upper part of a prism of angle 1.8° and material of refractive index 1.5. The light immerging out from the prism falls on a concave mirror of radius of curvature 40 cm. The distance of the point from the principle axis of the mirror where the light rays are focussed after reflection from the mirror is