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A Bauernfeind prism is a type of reflecting prism used to deviate a beam of light by 45° to 60°, depending on its construction, while neither flipping nor rotating the image. It is named for its inventor, the German expert of geodesy . The beam is reflected twice in the prism, with one reflection happening at less than the critical angle, therefore the prism requires a reflective coating for this surface to be usable in practice. A Bauernfeind prism with 45° beam deviation is also known as a half-penta prism or semipentaprism.〔(【引用サイトリンク】title=http://www.edmundoptics.com/optics/prisms/image-rotation-prisms/half-penta-prisms/3249 )〕〔(【引用サイトリンク】title=VOB Lumex -- Prisms )〕 A Bauernfeind prism is used together with a Schmidt roof prism to form a Schmidt–Pechan prism. == Applications == The Bauernfeind prism is commonly used in microscope tubes and in geodesy to deviate the path to the eyepiece in order make the device more ergonomic.〔 〕 More recent applications are glasses that deflect the viewing angle either downwards (for relaxed reading or watching TV〔(【引用サイトリンク】title=Prismenbrillen, Liegebrillen, Teleskopspiegel - REHADAT-Hilfsmittel )〕), or upwards (for watching a climber while belaying). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bauernfeind prism」の詳細全文を読む スポンサード リンク
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