is limited in size by its geometry since light reflected by it would either pass uselessly below the display or above it if the reflector were larger than the maximum dimension dictated by the vertical dimension of the display surface 15 this limitation does not exist with the reflector of 45 because no matter how near its front edge reaches toward the display surface 44 and no matter how far its rear edge extends away from that display surface the light beams reflected by all of its facets 47 will continue to be directed toward the focal point 55 of the lens and hence will fall upon the display surface 44 provided that it is properly placed in relation to the reflector naturally there will be a point of diminishing returns where the reflector becomes so large that light reflected from its outermost facets becomes attenuated by the time they reach the display surface 44 so that the benefit gained does not justify the added cost and size long before this point is reached however the total reflected light which can be directed by the fresnel reflector 45 onto the display surface 44 will exceed that which is attainable by the fresnel reflector 19 of fig2 for a display surface of the same size another reason why the fresnel reflector 45 of fig3 and 4 permits more light to be projected onto a display of a given size than its counterpart 19 in fig1 and 2 may be seen by comparing fig1 and 3 the fresnel reflector 19 having parallel facets all of which lie.