Wheatstone stereoscope

Wheatstone stereoscope

[¦wēt‚stōn ′ster·ē·ō‚skōp]
(optics)
A type of stereoscope that uses plane mirrors to enable the eyes to form a fused image of two pictures whose separation is greater than the interocular distance.
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A Wheatstone stereoscope uses two mirrors mounted at 90[degrees] to each other.