| 摘要 |
PURPOSE:To vary two reflecting surfaces by cutting a groove on the side of a reflecting surface or on the opposite side and holding the reflecting surface on two reflecting surfaces which are folded at an acute/obtuse angle and cross each other by a folding means about the groove. CONSTITUTION:One V-shaped groove 12 is cut in the reverse surface of a plane mirror 10 opposite its reflecting surface 11 and the reverse surface is divided by this groove 12 into surfaces 13a and 13b having nearly the same area. Then, L-shaped supports 14a and 14b are fixed back to back on the surfaces 13a and 13b symmetrically about the groove 12 and a turnbuckle type adjusting screw 16 is engaged threadably with the both 14a and 14b. Then, the adjusting knob 16 is turned in one or opposite direction to fold the whole plane mirror 10 along the groove and two surfaces are formed facing the reflecting surface 11, so that incident light 1 is reflected by those two planes.
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