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Each diagram shows a corresponding image. The first thing that you should check is if the image is drawn in the correct location. If not, then you can automatically rule out the diagram as being correct. See the first Know the Law section.
The second thing to check is the reflected ray. The reflected ray should always be drawn along the line of sight connecting the eye and the extremities (upper and lower) of the image. If the reflected rays are not drawn properly, then you can rule out the diagram as being correct. See the second Know the Law section.
The final thing to check is the incident ray. When sighting at the top of the image, light reflects off the mirror at the location where the line of sight intersects the mirror. The incident ray should start at the top of the object (not the bottom of the object) and travel to this point on the mirror. The same is true for when sighting at the bottom of the image. If the diagram satisfies these three criteria, then the ray diagram has been correctly drawn.
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