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Objective: To identify whether positive, negative, or zero work is being done, to identify the force that is doing the work, and to describe the energy transformation associated with such work.

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Lens Magnification Lab

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Use provided data to determine the object distance or focal length value that would provide a specified magnification and observe general trends in the data.

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Use information from one or more data representations to support claims regarding the relationship between focal length, object distance, and magnification.

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Extrapolate or interpolate using the provided data to determine an object distance or a focal length value that would provide a specified magnification.

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Magnification Lab A lab is being done to quantify the dependence of the magnification of an image upon the object distance and the focal length of a lens. The object distance (do) is the distance between an object and the lens. The focal length (f) is the distance from the focal point (F) to the lens. The magnification (M) of an image is the ratio of the image height to the object height. Magnification values are negative for inverted images. Students mark a smiley face upon a light bulb and mount it along a 2-meter stick. They place the lens at the 100-cm mark. They project the image of the light bulb onto a sheet of paper and measure the image height (hi). See Figure 1. Object positions are labeled 1, 2, 3, 4, and 5 and result in images 1', 2', 3', 4' and 5'. Table 1 shows the results for several trials with three different focal lengths. Figure 2 shows a plot of magnification versus object distance for the three different lenses. Use the diagram, data, and plot to answer the next several questions.

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