Projector
Videos
A projector or image projector is an optical device that projects an image onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent
Acer projector, 2012
DLP type home theatre projector in use
Ancient camera obscura effect caused by balistrarias in the Castelgrande in Bellinzona
Giovanni Fontana's drawing from c. 1420 of a figure with lantern projecting a winged demon
Overhead projector
Videos
An overhead projector, like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience.
Projector
…projector used today is called a video projector. Video projectors are digital replacements for earlier types of projectors such as slide projectors and overhead projectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and early 2000s, but old analog projectors…
Overhead projector in operation during a classroom lesson
Mirror and lens
A worker loads documents into an Ozalid printer.