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The 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.
The earliest reference to a specific magnetic "direction finder" device for land navigation is recorded in a Song dynasty book dated to 1040–44. There is a description of an iron "south-pointing fish" floating in a bowl of water, aligning itself to the south. The device is recommended as a means of orientation "in the obscurity of the night."
Mary Violet Leontyne Price (/ l i ˈ ɒ n t iː n, ˈ l iː ə n t iː n / lee-ON-teen, LEE-ən-teen; born February 10, 1927) is an American spinto soprano who was the first African-American soprano to receive international acclaim. [1] From 1961 she began a long association with the Metropolitan Opera.
Neil Stuppel Price is an English archaeologist specialising in the study of Viking Age Scandinavia and the archaeology of shamanism. He is currently a professor in the Department of Archaeology and Ancient History at Uppsala University , Sweden.
Typical pair of single vision glasses. Single vision lenses correct for only one distance. If they correct for far distance, the person must accommodate to see up close. If the person cannot accommodate, they may need a separate correction for near distances, or else use a multifocal lens (see below).
Recumbent or prism glasses are glasses that use a prism with a 90° refraction to allow the wearer to read or view a screen while lying on their back. Developed by Liverpudlian ophthalmologist Andrew McKie Reid in the 1930s to assist people bedbound by chronic illness or spinal injury, recumbent glasses have more recently been marketed not ...
Google Glass can be controlled using the touchpad built into the side of the device. Touchpad: A touchpad, similar to that of one on a laptop, is located on the side of Google Glass, allowing users to control the device by swiping through a timeline-like interface displayed on the screen. [34]
A prism coupler is a prism designed to couple a substantial fraction of the power contained in a beam of light (e.g., a laser beam) into a thin film to be used as a waveguide without the need for precision polishing of the edge of the film, without the need for sub-micrometer alignment precision of the beam and the edge of the film, and without the need for matching the numerical aperture of ...