two mirrors, but a third image I3 is also present, formed by sequential reflections from both mirrors. All parts of Figure 3-14 and the related discussion above should be understood clearly because they are fundamental to the optics of images. Look at Example 5.
Making use of the law of reflection and the conclusions drawn from Figure 3-14, draw the image of the letter L positioned above a plane mirror as shown below in (a).
Solution: Make use of the fact that each point on the image is as far below the mirror—along a line perpendicular to the mirror—as the actual object point is above the mirror. Indicate key points on the object and locate corresponding points on the image. Sketch in the image as shown in (b).
B. Images formed with spherical mirrors
As we showed earlier in Figure 3-6, the law of reflection can be used to determine the direction along which any ray incident on a spherical mirror surface will be reflected. Using the law of reflection, we can trace rays from any point on an object to the mirror, and from there on to the corresponding image point. This is the method of graphical ray tracing.
1. Graphical ray-trace method To employ the method of ray tracing, we agree on the following:
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