... kinds of high precision prisms, i.,e, right angle prisms, corner cubes, penta prisms, dove prisms, roof prisms, rhomboid prisms or other irregular shape, ... glass BK7, fused silica, sapphire etc.Many types of prisms each having a particular geometry to achieve the reflections ... necessary to perform a specific imaging task. Reflecting prisms may invert, rotate, deviate or displace a beam. ...