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Figure 9-1.  Deviation of Light Rays Through a Converging Lens
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TM 9-254 9-1. Optical Terms - Continued Figure 9-3.  Newtons Rings m. Parallax  Shield.    A  device  used  to  reduce  parallax  between  the  sighting  instrument  and  the  field  of  view. Placed over the eyepiece end of the instrument it will restrict the movement of the viewer’s eye and minimize the apparent displacement of one object with respect to another, that is, the reticle and the target.  The parallax shield (fig. 9-4) can be fabricated from cardboard, tape, or metal with approximately a1/l6 inch hole located in the center. Figure 9-4.  Parallax Shield Change 2  9-3

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