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In contrast, a modern LCD or DLP projector often uses an Ultra-high-performance lamp which has a higher luminous efficacy and lasts for thousands of hours. [5] A drawback of that technology is the warm up time required for such lamps. Older overhead projectors used a tubular quartz bulb which was mounted above a bowl-shaped polished reflector.
Diafilm strip Dukane Record Automatic Filmstrip Projector Dukane Silent filmstrip projector Music captioned filmstrip set, titled "Composers of many lands and many times by Eye Gate House Inc 1954" The filmstrip is a form of still image instructional media , once widely used by educators in primary and secondary schools (K–12) and for ...
Acer projector, 2012 DLP type home theatre projector in use. A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image ...
A professor using an LCD projector as an instructional aid. Audiovisual (AV) education or multimedia-based education (MBE) is an instruction method where particular attention is paid to the audiovisual or multimedia presentation of the material to improve comprehension and retention.
Digital media in education refers to an individual's ability to access, analyze, evaluate, and create media content and communication in various forms. [1] This includes the use of multiple digital software applications, devices, and platforms as tools for learning. The integration of digital media in education has been increased over time ...
This slide projector, sold under the Zeiss Ikon brand, uses a straight-through tray; a thin arm grabs slides from a tray and puts them into the light path; the tray is advanced along its length. At the front of the projector, the protruding projection lens features rings to control focal length and focus.