The lens of a slide projector with a focal length of 900 mm
The lens of a slide projector with a focal length of 90.0 mm projects a slide onto a screen that is 15.0 m away. How far from the lens must the slide be placed to form a sharp image on the screen?(in cm)
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the lens of a slide projector with a focal length of 1000 mm projects a slide onto a screen that is 100 m away how far
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the lens of a slide projector with a focal length of 900 mm projects a slide onto a screen that is 150 m away how far
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