The three principal rays used in ray tracing include:
1. An incident ray traveling parallel to the principal axis of a diverging lens is refracted through the lens and travel in a direction such as its extension will pass through the near focal point.
2. An incident ray travelling towards the near focal point towards the lens, which will be refracted through the lens and travel parallel to the principal axis.
3. An incident ray passing through the center of the lens, which will in effect continue in the same direction that it had when it entered the lens.
A) Draw a ray diagram for the following situation (an object far from the lens) involving a diverging lens. The ray tracing needs to have the three principal rays.
B) Use a ruler to measure the object distances, image distances, and focal lengths for the ray diagram. Then verify that your measurements are correct with the thin-lens equation.
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