Dove prisms are Right Angle Prisms with the top removed. They can be used to reverse the image. It can be coated on the side where the light is reflected for optical sensing applications.Right-angle roof Optical Glass Prisms are usually used for binoculars or when a right-angle deflection of the image is required. The image is deflected from left to right instead of top to bottom.The pentagonal roof prism deflects the beam by 90 degrees without deflecting it from left to right or top to bottom.The output beam generated by the rhombus prism is displaced from the input beam, but it does not change the direction of the beam, nor does it reverse the image.