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Australian rappel demonstrated at a dam in Norway Climber performing Australian rappel on Orlando Power Station cooling towers in Soweto, South Africa. Australian abseiling (also known as Australian rappelling, Rap Jumping, Angel Jumping or deepelling) is the process of descending a fixed rope in a standing position while facing the ground.
A flipped image is a static or moving image that is generated by a mirror-reversal of an original across a horizontal axis, making the image upside-down. In contrast, a flopped image is mirrored across the vertical axis, as in a conventional mirror image .
A Dove prism is a type of reflective prism which is used to invert an image. Dove prisms are shaped from a truncated right-angle prism. The Dove prism is named for its inventor, Heinrich Wilhelm Dove. Although the shape of this prism is similar to the shape described by a dovetail joint, the etymology of the two is unrelated.
A real image occurs at points where rays actually converge, whereas a virtual image occurs at points that rays appear to be diverging from. Real images can be produced by concave mirrors and converging lenses, only if the object is placed further away from the mirror/lens than the focal point, and this real image is inverted. As the object ...
Abseiling (/ ˈ æ b s eɪ l / AB-sayl or / ˈ ɑː p z aɪ l / AHP-zyle; from German abseilen 'to rope down'), also known as rappelling (/ ˈ r æ p ɛ l / RAP-pell or / r ə ˈ p ɛ l / rə-PELL; from French rappeler 'to recall, to pull through'), is the controlled descent of a steep slope, such as a rock face, by moving down a rope.
Upside down goggles, also known as "invertoscopes" by Russian researchers, [1] are optical instruments that invert the image received by the retinas upside down. They are used to study human visual perception, particularly psychological process of building a visual image in the brain. Objects viewed through such a device appear upside down and ...
Double Porro prism systems are used in small optical telescopes to re-orient an inverted image (an arrangement is known as an image erection system), and especially in many binoculars where they both erect the image and provide a longer, folded distance between the objective lenses and the eyepieces. When there is an air gap between the two ...
In general, an object and its mirror image are called enantiomorphs. If a point of an object has coordinates (x, y, z) then the image of this point (as reflected by a mirror in the y, z plane) has coordinates (−x, y, z). Thus reflection is a reversal of the coordinate axis perpendicular to the mirror's surface.