Dove prism is a type of reflective prism which is used to invert an image. Dove prisms are shapedfrom a truncated right-angle prism. A beam of light entering one of the sloped faces of the prism undergoes total internal reflection from the inside of the longest (bottom) face and emerges from the opposite sloped face. Images passing through the prism are flipped, and because only one reflection takes place, the image's handedness is changed to the opposite sense.
　　　　　Specifications: 

Material:	BK7
Diameter Tolerance:	+0.0/-0.2mm
Angle Tolerance:	±3 arc minutes
Flatness:	l/2 @ 632.8nm
Surface Quality:	60/40
Clear Aperture:	>80%
Bevel:	<0.2-0.5mm X 45°
Coating:	Uncoated