will now be reflected by curved reflective surface 216 at point 207 in direction 213 making an angle 2 u03b1 to ray 204 also ray 203 is now reflected at point 208 in direction 214 making an angle 2 u03b1 to ray 202 incoming rays parallel to 201 and 203 are reflected by 216 in directions contained between those of 213 and 214 the output pattern is then spread by a total angle 4 u03b1 similar u201c bumps u201d can be added to surface 205 resulting in an irregular surface fig3 a shows a 3d view of a reflective profile 301 of a collimating optic with circular symmetry around axis 302 the meridian plane shape of the u201c bump u201d on the reflective surface is defined by circular space curve profile 303 with center 304 although other shape profiles are also possible as described above and space curve profile 305 profile 303 can be convex or concave as in fig2 a and fig2 b the same is true for profile 305 this results in four possible shapes for the lenticulation based on profiles 303 and 305 the shape of the u201c bump u201d in the direction perpendicular to the vertical plane containing axis 302 and curve 301 is defined by another circular profile 305 with center 306 located on line 307 perpendicular to profile 301 arc 305 is defined by its radius and its angular aperture as seen from its center 306 these two parameters can be adjusted by imposing two conditions fig3 b shows again the same u201c bump u201d profiles 303 and 305 as in fig3 a a light ray 308 coming from source 310 hits the edge 309 of profile 305 and leaves in a direction that makes an angle 2 u03b1 to the vertical parallel.