View expanding and directing optical system

摘要: A view expanding and directing optical system for use in viewing around obstacles the like comprising combination a negative Fresnel lens prism disposed separate planes immediately adjacent one another. In preferred embodiment, is mounted on vehicle, at rear thereof, whereby provides an expanded demagnified area to of below level window and/or laterally vehicle. other embodiments, may be coupled means extending or retracting it desired times, used conjunction with vision aiding elements, such as rearview periscope, providing