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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°.
The motor system acts to point both eyes at the target of interest; any offset is detected visually (and the motor system corrects it). Heterophoria occurs only during dissociation of the left eye and right eye, when fusion of the eyes is absent.
In this example the first eye, with a −1.00 diopter prescription, is the stronger eye, needing only slight correction to sharpen the image formed, and hence a thin spectacle lens. The second eye, with a −4.00 diopter prescription, is the weaker eye, needing moderate correction to sharpen the image formed, and hence a moderately thick ...
With respect to FWER control, the Bonferroni correction can be conservative if there are a large number of tests and/or the test statistics are positively correlated. [ 9 ] Multiple-testing corrections, including the Bonferroni procedure, increase the probability of Type II errors when null hypotheses are false, i.e., they reduce statistical ...
Greenwald said low level Analysts can, via systems like PRISM, "listen to whatever emails they want, whatever telephone calls, browsing histories, Microsoft Word documents. [31] And it's all done with no need to go to a court, with no need to even get supervisor approval on the part of the analyst."
A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers.
Since it was established, the department has had to cope with a dramatic growth in the prison population. Between 1997 and 2011 the number of inmates increased by 70% [7] and, at 201 prisoners per 100,000 of population (in 2018), New Zealand has one of the higher rates of imprisonment in the Western world. [8]
In fluid dynamics, Stokes' law is an empirical law for the frictional force – also called drag force – exerted on spherical objects with very small Reynolds numbers in a viscous fluid. [1] It was derived by George Gabriel Stokes in 1851 by solving the Stokes flow limit for small Reynolds numbers of the Navier–Stokes equations .
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