point and an origin is at a distance r from the mirror surface where r is the radius of curvature of the mirror if the source is displaced from this origin by an amount x y z as is shown in fig4 then an image will be formed at the point u2212 x u2212 y u2212 z with a magnification which is one providing x y and z are all much less than r this property can be used to make a switch by moving the mirror either translating or rotating so that the optical axis is different for two or more switch positions this is illustrated in fig5 where one fiber input is switched between two outputs when the mirror axis is midway between the source s and the receiver a light from the source is coupled into receiver a similarly the path of the light may be switched to receiver b by moving the mirror axis midway between s and b not shown to minimize the coupling loss the fibers must be arranged in an array such that the optical axes of all the fibers converge at a common point located at the plane of the mirror fig6 a amp b show an array of six fibers for two mirror positions or states and demonstrates that many interconnections are made simultaneously for each.