Quantcast Figure 9-15.  Right Angle Prism Showing Deflection of Light Rays

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TM 9-254 9-2. Optical Components - Continued (6) Right  Angle  Prism.    A  right  angle  prism  will  bend  light  rays  through  an  angle  of  90  degrees  or  180 degrees depending on which reflecting surface is used (fig. 9-15).  In basic panoramic optical systems it is normally used to reflect light rays through a 90 degree angle. Figure 9-15.  Right Angle Prism Showing Deflection of Light Rays (7) Wedge.    Optical  wedges  used  in  fire  control  instruments  are  prisms  with  two  plane  surfaces  at  slight angles which divert the paths of light through small angles by refraction instead of by reflection (fig. 9- 16).  They are used where the angle of deviation required may be a matter of fractions of seconds and it would not be practical to produce such slight deviations by means of reflection surfaces.  Wedges are used in measurement systems of range finders and to correct or adjust the alinement of paths of light. Figure 9-16.  Light Deviations Through an Optical Wedge Change 2  9-10

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