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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 ...
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. ...
Two of the FVEY information collection mechanisms are the PRISM program and the Upstream collection system. The PRISM program gathers user information from technology firms such as Google , Apple , and Microsoft ; while the Upstream system gathers information directly from civilian communications as they travel through infrastructure like fiber ...
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.
Brent Weeks (born March 7, 1977) is an American fantasy writer. His debut novel, The Way of Shadows, was a New York Times best seller in April 2009. [1] [failed verification] Each of the five books in his Lightbringer series made the NYT list as well, starting with The Black Prism in 2010.
The unilateral cover test is performed by having the patient focus on an object then covering the fixating eye and observing the movement of the other eye. If the eye was exotropic, covering the fixating eye will cause an inwards movement; and if esotropic, covering the fixating eye will
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