359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
838 | DF | MIRROR {14} |
850 | DF | .~ Plural mirrors or reflecting surfaces {7} |
857 | DF | .~.~ With successive reflections {4} |
858 | .~.~.~ Including curved mirror surfaces in series {1} | |
859 | DF | .~.~.~.~> With concave and convex mirrors in series |