- #1
wakejosh
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Homework Statement
An object and a screen are separated by 20 cm. A convex lens is placed between them, 5 cm from the object. In this position it causes a sharp image of the object to form on the screen. What is the focal length of the lens?
The Attempt at a Solution
wouldn't it just be 5 cm since it is producing a sharp image on the screen? the distance from the object to the lense?