You might know the camera obscura, which works only for very luminous situations. Camera lucida (light chamber) was developed by W. H. Wollaston in 1807 to draw landscapes etc. with ease.
The main component is a 4-sided glass prism. From the oject G the light is seen by the eye A in Z, where the pencil can be used to draw the object.
When the instrument is built with mirrors rather than a prism it is called mirror lucida.
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