What is the Full Form of OHP ?

OverHead Projector - An above projector (frequently shortened to OHP), like a film or slide projector, utilizes light to extend a broadened picture on a screen, permitting the perspective on a little record or picture to be imparted to an enormous audience.In the above projector, the wellspring of the picture is a page-sized sheet of straightforward plastic film (otherwise called "foils" or "transparencies") with the picture to be projected either printed or transcribed/drawn. These are put on the glass platen of the projector, which has a light source beneath it and a projecting mirror and focal point gathering above it (subsequently, "above"). They were generally utilized in training and business before the coming of video projectors.An above projector deals with similar guideline as a slide projector, in which a shining focal point extends light from an enlightened slide onto a projection screen where a genuine picture is shaped. Anyway a few distinctions are required by the a lot bigger size of the transparencies utilized (for the most part the size of a printed page), and the necessity that the straightforwardness be set face up (and coherent to the moderator). For the last option reason, the projector incorporates a mirror not long previously or after the centering focal point to overlap the optical framework toward the level. That reflect likewise achieves an inversion of the picture all together that the picture projected onto the screen compares to that of the slide as seen by the moderator peering down at it, as opposed to an identical representation thereof. Consequently, the straightforwardness is put face up (close to the mirror and centering focal point), conversely, with a 35mm slide projector or film projector (which need such a mirror) where the slide's picture is non-switched as an afterthought inverse the centering lens.A related innovation for extending straightforward pictures is the sun based camera, however a comparative reason for misty materials is served by the epidiascope.