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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°. A double Porro system provides four ...
8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.
Rolling Stone. [4] Double Vision is the second studio album by the British-American rock band Foreigner, released on 20 June 1978 by Atlantic Records. Recorded between December 1977 and March 1978, it was Foreigner's only album co-produced by Keith Olsen and the last recording with bass guitarist Ed Gagliardi who would be later replaced by Rick ...
to correct refractive errors of the eye; a little invasive. Phoropter. used in refraction testing. Tonometers. used to determine the intraoccular pressure (IOP) - useful in glaucoma; video link for various types of tonometers. Speculum: to keep the eyes open during any operation. Universal eye speculum.
Fixation disparity. Fixation disparity is a tendency of the eyes to drift in the direction of the heterophoria. While the heterophoria refers to a fusion-free vergence state, the fixation disparity refers to a small misalignment of the visual axes when both eyes are open in an observer with normal fusion and binocular vision. [1]
Double diffusive convection is a fluid dynamics phenomenon that describes a form of convection driven by two different density gradients, which have different rates of diffusion. [2] Convection in fluids is driven by density variations within them under the influence of gravity. These density variations may be caused by gradients in the ...
A double-Amici prism, showing the apex angles (and ) of the three elements, and the angles of incidence and refraction ′ at each interface. The deviation angle of the ray transmitted by the prism is shown as δ {\displaystyle \delta }
Ultraviolet (UV) spectroscopy or ultraviolet–visible (UV–VIS) spectrophotometry [1] [2] [3] refers to absorption spectroscopy or reflectance spectroscopy in part of the ultraviolet and the full, adjacent visible regions of the electromagnetic spectrum. [2] Being relatively inexpensive and easily implemented, this methodology is widely used ...
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