AccelePrep for the ACT Test 2nd Edition Student Text

C HAPTER 11 | H YPER P REP S CIENCE • 217

4. Which of the following graphs best represents the relationship between object distance and image distance for a thin converging lens in air? F.

5. Focal length is the distance between the center of a lens and the point at which a clear image of a very distant object is formed. For a thin converging lens in air, the lens formula relates focal length, f , to object distance, o , and image distance, i : 1 1 1 f i o Using this information, what is the focal length of the lens used in Experiment 1? A. 33.3 cm B. 40 cm C. 10 cm D. 5 cm STRATEGY ALERT Deploy the following Research Summary strategies: 1. Identify the controls and the variables. For a given experiment, the controls are constant—only the investigated factor for that particular experiment is varied. 2. Anticipate how to alter experimental variables to support alternative hypotheses and predict the results of these new experiments. 3. For depicted data trends, determine any proportional or inverse relationships between the investigated factor and the experimental results. 4. If an assumption is faulty because it is not supported by the given information, the experiment may fail to prove the hypothesis, and conclusions based on the assumption may therefore be invalid. Question the validity of any assumptions.

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