The instrument that is based on the principle that when an object is placed between the first principal focus and the optic center of a convex lens, an upright, virtual and enlarged image on the same side of the object is formed.
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In astronomical telescope, convex lens called eyepiece, and objective lens are used and object is placed before eyepiece lens, such that final image inverted, a camera and eye also form inverted image on the screen. Whereas simple microscope gives an erect, virtual and enlarged image of the object placed between first principal focus and the optic nerve of the convex lens. In a projector, the image formed is real, inverted magnified on the other side of the lens. This inverted image is again inverted by the film.
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