An object at a distance p from a thin glass lens produces an image at a distance q from
Chapter 0, Problem 61(choose chapter or problem)
An object at a distance p from a thin glass lens produces an image at a distance q from the lens, where 1 p + 1 q = 1 f . The constant f is called the focal length of the lens. Suppose an object is moving at 3 mm per second toward a lens of focal length 15 mm. How fast and in what direction is the image moving at the moment at which the object is 35 mm from the lens
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