Calculate the focal length of the lens and situate the image
A thin positive lens produces an 8 cm tall erect image of a 5 cm tall object positioned 90 cm from the lens. Calculate the focal length of the lens and situate the image.
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A positive thin lens is employed to project the enlarged image of a slide onto a wall 10 m away. When the slide is 20 X 30 mm, and if its image is to be 2 X 3 m, what should be the focal length of the lens and the distance from it to slide?
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A simple camera includes of a thin positive lens that casts a real image on the film plane. Assume that the lens consists of a 50 mm focal length. Determine how far from a 1 m tall object should the camera be when the image is to appear 25 mm high
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