What was the image erect or upside down ?
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An erect image is formed when both rays intersect each other at a certain point. It is an image in which directions are the same as those in the object, in contrast to an inverted image. Some telescopes and other devices such as the camera obscura present an inverted image on the viewing surface.
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The image focussed on the retina with the aid of an optical system is said to be inverted, in contrast to erect, when the orientation of the image is upside-down in comparison to the object as seen with the unaided eye. The image formed on the film or frosted glass plate of a single-lens camera is inverted.
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