Concept explainers
Draw the continuation of the two remaining rays shown on the diagram through the lens and out the other side.
The rays you drew in parts A, B, and D are called principle rays, and they are useful in determining the location of an image. In some cases, one or more of these rays may not actually pass through the lens; however, they may still be used in determining the image location. The principle rays are only a few of the infinitely many that we might draw from one point on the object.
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