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Soulshake · Answer 1 · 2019-10-22T11:02:10+0000

A Pentaprism is five sided and a prism with two silvered surfaces giving a never ending light of rays of light through 90 degrees.

Tekito · Answer 2 · 2019-10-26T11:43:43+0000

Pentaprism is a five sided prism with two silvered surfaces giving a non-stop deviation of all rays of light through 90 degress. Used in viewfinders of single-lens reflex cameras

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