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2. Perger prism - Wikipedia

   en.wikipedia.org/wiki/Perger_prism

   A Perger prism or Perger–Porro prism system is a prism, that is used to invert (rotate by 180°) an image. The special feature of this prism is that, like a traditional double Porro prism system, it manages this with only four beam deflections and has neither a roof edge with the accompanying phase correction problems, a mirrored surface or ...

3. Porro prism - Wikipedia

   en.wikipedia.org/wiki/Porro_prism

   Porro prisms are most often used in pairs, forming a double Porro prism. A second prism rotated 90° with respect to the first, is placed such that light will traverse both prisms. The net effect of the prism system is a beam parallel to but displaced from its original direction, with the image rotated 180°.

4. Wedge prism - Wikipedia

   en.wikipedia.org/wiki/Wedge_prism

   The wedge prism is a prism with a shallow angle between its input and output surfaces. This angle is usually 3 degrees or less. Refraction at the surfaces causes the prism to deflect light by a fixed angle. When viewing a scene through such a prism, objects will appear to be offset by an amount that varies with their distance from the prism.

5. Prism (Rainbow EP) - Wikipedia

   en.wikipedia.org/wiki/Prism_(Rainbow_EP)

   Prism is the fourth extended play by South Korean girl group Rainbow. It was released on February 15, 2016 by DSP Media and distributed by LOEN Entertainment . Background

6. The Blinding Knife - Wikipedia

   en.wikipedia.org/wiki/The_Blinding_Knife

   Before he can progress further, the Prism comes to speak with him. After a long, intense inner debate, the Prism appears to decide to release Gavin and exile himself. He then shoots Gavin instead. Now that the Prism has lost control of Green, a Green bane is forming, and conveniently located at the Color Prince's next site for a hostile takeover.

7. Prism fusion range - Wikipedia

   en.wikipedia.org/wiki/Prism_fusion_range

   The prism fusion range (PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists, optometrists, and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision in the presence of increasing vergence demands.