High Quality Content by WIKIPEDIA articles! The magic lantern or Laterna Magica was an early prototype of the modern slide projector. The magic lantern has a concave mirror behind a light source that gathers light and projects it through a slide with an image painted onto it. The light rays cross an aperture (which is an opening at the front of the apparatus), and hits a lens. The lens throws an enlarged picture of the original image from the slide onto a screen. Main light sources used during the time it was invented in the late 1600s were candles or oil lamps. These light sources were quite inefficient and produced weak projections. The invention of the Argand lamp in the 1780s helped to make the projected images brighter. The invention of the limelight in the 1820s made it even brighter, and following that the inventions of the electric arc lamp in the 1850s, and then incandescent electric lamps all further improved the projected image of the magic lantern.

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