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Prism correction is commonly specified in prism dioptres, a unit of angular measurement that is loosely related to the dioptre. Prism dioptres are represented by the Greek symbol delta (Δ) in superscript. A prism of power 1 Δ would produce 1 unit of displacement for an object held 100 units from the prism. [2]
Because the Throne Verse is believed to grant spiritual and physical protection, it is often recited by Muslims before setting out on a journey and before going to sleep. [15] [6] [11] [16] Reciting the verse after every prayer is believed to grant quick entry to paradise without any delay. [17] [18]
A hanged wolf in sheep's clothing. A 19th century illustration of the mediaeval fable attributed to Aesop. False prophets are frequently referred to in the New Testament, sheep were an important part of life in the Galilee of Jesus' era, and the metaphor of the pious as a flock of sheep is a common one in both the Old and New Testaments.
Prism adaptation is a sensory-motor adaptation that occurs after the visual field has been artificially shifted laterally or vertically. It was first introduced by Hermann von Helmholtz in late 19th-century Germany as supportive evidence for his perceptual learning theory (Helmholtz, 1909/1962).
In geometry, the pentagrammic prism is one of an infinite set of nonconvex prisms formed by square sides and two regular star polygon caps, in this case two pentagrams. It is a special case of a right prism with a pentagram as base, which in general has rectangular non-base faces.
Stratton wore these glasses over his right eye and covered the left with a patch during the day, and slept blindfolded at night. Initial movement was clumsy, but adjusting to the new environment took only a few days. Stratton tried variations of the experiment over the next few years. First he wore the glasses for eight days, back at Berkeley.
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