An overheadprojector is a device that casts a transparency image on a screen . The process
of using an overheadprojector includes the following steps . First , an OHP is placed on a table
poisoned several feet from a screen and plugged into an electrical socket . Next ,
a transparency is placed face up on the plate glass surface of OHP ,and the switch i turned on .
After this , the height of OHP is adjusted so that image is centered on the screen , and the focus
knob is turned until projecting a clear image . finally , the transparency is replaced with the
next transparency , and the sixth step is replaced .
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