Schematic showing the definitions of the spatial and angular GH shifts, X_sGH and Θ_aGH (top), and the spatial and angular IF shifts, Y_sIF and Θ_aIF (bottom), for an (initially converging) beam of light incident on a metallic mirror. Darker colors within the reflected beam indicate a higher relative intensity. The orientation of the xyz reference frame before and after reflection is indicated. Positive spatial GH and IF shifts are directed in the positive x- and y-directions, respectively, after reflection (the spatial GH shift is shown in the negative direction). The angular GH and IF shifts are positive for a right-handed rotation around the y-axis and a left-handed rotation around the x-axis, respectively. For clarity the size of the shifts is shown extremely exaggerated.