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An object and a screen are separated by 27.00 cm. A convex lens is placed between...

An object and a screen are separated by 27.00 cm. A convex lens is placed between them, 15.00 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, in centimeters?

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ヲ 2 cm V Lu S-12 21

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