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The B in BK7 indicates that it is a borosilicate glass composition. BAK-4 barium crown glass (glass code 569560) has a higher index of refraction than BK7, and is used for prisms in high-end binoculars. In that application, it gives better image quality and a round exit pupil. An achromatic doublet, which combines crown glass and flint glass.
It is made from a piece of glass shaped like four right-angled reflecting prisms joined face-to-face in a twisted fashion. Light enters one flat face, is internally reflected four times (incident at an angle of 45º) from the sloping faces of the prism, and exits the second flat face offset from, but in the same direction as the entrance beam.
Prism spectacles with a single prism perform a relative displacement of the two eyes, thereby correcting eso-, exo, hyper- or hypotropia. In contrast, spectacles with prisms of equal power for both eyes, called yoked prisms (also: conjugate prisms, ambient lenses or performance glasses) shift the visual field of both eyes to the same extent. [5]
The prism is made from two glass prisms, which are optically cemented together to form a symmetric, shallow Vee-shaped assembly. Light enters one face at normal incidence, is internally reflected from a 30° sloped face, and then is reflected from a "roof" (German Dach ) section (consisting of two faces meeting at a 90° angle) at the bottom of ...
The top angle of the prism (the angle of the edge between the input and output faces) can be widened to increase the spectral dispersion. However it is often chosen so that both the incoming and outgoing light rays hit the surface at around the Brewster angle; beyond the Brewster angle reflection losses increase greatly and angle of view is ...
Types of blinds: Wood; Faux wood (also known by brand names such as Plaswood) Vinyl blinds in various sizes, e.g. 25 mm (1 in) and 50 mm (2 in) Vinyl and fabric for vertical blinds; Aluminum; A shade is a piece of fabric which rolls, stacks or folds to expose or cover a window. Some shades allow for views through (e.g. sheer shades). Types of ...
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