Dukane's model 640 Stationary Overhead Projector puts high lumen output in the hands of classroom users. The affordable projector, which boasts rack and pinion focus, features a transmissive design ...
While data projectors are popular tools for business meetings, the overhead projector still has some significant benefits. For interactive presentations, an overhead projector lets you write directly ...
Description: A green LED with a clear envelope is used as a photodetector. Red and green filters are used to demonstrate the wavelength dependence of the photodetection. The LED is mounted on a ring ...
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