forming a notch into the second optical element and depositing a bead of adhesive into the notch such that the adhesive adheres to both the notch and the first optical element application_number US 8594105 A description the invention will be more fully illustrated by the following detailed description of specific embodiments in conjunction with the accompanying drawing figures in the figures similar components and or features may have the same reference label fig1 is a front right top view of a plane mirror inverting an image of an object according to the prior art fig2 is a front top view of a hollow roof mirror inverting and reversing an image of an object according to the prior art fig3 is an exploded front right top view of a porro prism inverting and reversing an image of an object according to the prior art fig4 is a front right top view of a hollow roof prism according to the prior art fig5 is a front right top view of a framed hollow roof mirror according to the prior art fig6 is a front right top view of a frameless hollow roof mirror according to one embodiment of the present invention fig7 is a front right top view of a portion of the frameless hollow roof mirror of fig6 detailing the apex of the roof fig8 is an exploded front right top view of the frameless hollow roof mirror of fig6 fig9 is an exploded front right top view of a portion of the frameless hollow roof mirror of fig6 detailing abutting surfaces at the apex of the roof the structure of the invention will now be illustrated by explanation of specific exemplary embodiments shown in the.