The lens of a slide projector with a focal length of a 120
The lens of a slide projector with a focal length of a 120 mm projects a slide onto a screen that is 13 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 a 120 mm projects a slide onto a screen that is 13 m away how far
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