Posted by khan on Sunday, December 9, 2012 at 12:20am.
I suggest you review the previous "Related Questions" answers below, and use your powers of reasoning.
A light box is a box with a white translucent window on one side and a light bulb inside.
An opaque projector projects images of opaque objects on a screen.
You must know what cameras and copiers are.
I assume you know what slides are, although slide film isn't used much anymore.
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