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2. Prism (Katy Perry album) - Wikipedia

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

   Prism is the fourth studio album by American singer Katy Perry. It was released by Capitol Records on October 18, 2013. While the album was initially planned to be "darker" than her previous material, Prism ultimately became a prominently dance-inspired record. Perry worked with several past collaborators, while enlisting new producers and ...

3. Hirschberg test - Wikipedia

   en.wikipedia.org/wiki/Hirschberg_test

   The Krimsky test is essentially the Hirschberg test, but with prisms employed to quantitate deviation of ocular misalignment by determining how much prism is required to centre the reflex [2] The Krimsky test is advisably used for patients with tropias, but not with phorias.

4. Four prism dioptre reflex test - Wikipedia

   en.wikipedia.org/wiki/Four_prism_dioptre_reflex_test

   The Four Prism Dioptre Reflex Test (also known as the 4 PRT, or 4 Prism Dioptre Base-out Test) is an objective, non-dissociative test used to prove the alignment of both eyes (i.e. the presence of binocular single vision) by assessing motor fusion. [1]

5. Pentaprism - Wikipedia

   en.wikipedia.org/wiki/Pentaprism

   A pentaprism. A perspective drawing showing a roof pentaprism commonly used in a single lens reflex camera (SLR). The image is flipped laterally by the prism. A pentaprism is a five-sided reflecting prism used to deviate a beam of light by a constant 90°, even if the entry beam is not at 90° to the prism.

6. Retroreflector - Wikipedia

   en.wikipedia.org/wiki/Retroreflector

   A typical surveying prism with back target. In surveying, a retroreflector—usually referred to as a prism—is normally attached on a surveying pole and is used as a target for distance measurement, for example, a total station. The instrument operator or robot aims a laser beam at the retroreflector. The instrument measures the propagation ...

7. Visible spectrum - Wikipedia

   en.wikipedia.org/wiki/Visible_spectrum

   White light is dispersed by a prism into the colors of the visible spectrum.. The visible spectrum is the band of the electromagnetic spectrum that is visible to the human eye. ...