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Prism dioptres. 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]
Vocalist Kobi Oz and guitarist Rami Yosifov (hidden behind Oz) performing on Students Day at the Hebrew University of Jerusalem, 21 May 1997. Teapacks (also known as Tipex) ( Hebrew: טיפקס) is an Israeli band that formed in 1988 as HaHotzaa La'Poal (Hebrew: ההוצאה לפועל , The Execution) in the southern Israeli city of Sderot.
Prentice position. The Prentice position is an orientation of a prism, used in optics, optometry and ophthalmology. [1] In this position, named after the optician Charles F. Prentice, the prism is oriented such that light enters it at an angle of 90° to the first surface, so that the beam does not refract at that surface.
A correction fluid is an opaque, usually white fluid applied to paper to mask errors in text. Once dried, it can be handwritten or typed upon. It is typically packaged in small bottles, with lids attached to brushes (or triangular pieces of foam) that dip into the fluid. The brush applies the fluid to the paper.
The refractometer is used to help identify gem materials by measuring their refractive index, one of the principal properties used in determining the type of a gemstone. Due to the dependence of the refractive index on the wavelength of the light used ( i.e. dispersion ), the measurement is normally taken at the wavelength of the sodium line D ...
The latter fact attracted the attention of some correction fluid manufacturers from the Mancunian nebula. The manufacturers worked out that if they could get Lallafa to use their fluids in a variety of leafy colours in the course of his work, their companies would be as successful as the poems themselves. They therefore traveled back in time ...
A cleft lip contains an opening in the upper lip that may extend into the nose. [1] The opening may be on one side, both sides, or in the middle. [1] A cleft palate occurs when the palate (the roof of the mouth) contains an opening into the nose. [1] The term orofacial cleft refers to either condition or to both occurring together.
Canine parvovirus (also referred to as CPV, CPV2, or parvo) is a contagious virus mainly affecting dogs and wolves. CPV is highly contagious and spreads from dog to dog by direct or indirect contact with their feces. Vaccines can prevent this infection, but mortality can reach 91% in untreated cases.
Corrective lenses. A corrective lens is a lens worn on or before the eye. They are used to treat myopia, hypermetropia, astigmatism, and presbyopia .
The compass was invented in China during the Han dynasty between the 2nd century BC and 1st century AD where it was called the "south-governor" ( sīnán 司南) or "South Pointing Fish" ( 指南魚 ). [3] The magnetic compass was not, at first, used for navigation, but for geomancy and fortune-telling by the Chinese.