
Concept explainers
Two thin convex lenses and an object are arranged as shown below. Two rays from the tip of the object are drawn in order to determine the location of the image produced by lens 1. Lens 2 is placed so that one of its focal points coincides with the location of the image produced by lens 1
- Treating the image produced by lens 1 as an object for lens 2, draw two rays from the tip of this image that pass through lens 2. (Note that one of the principal rays cannot be drawn in this case.)
Using either geometry or trigonometry, show that these two principal rays are parallel on the right side of lens 2. (Hint: Look for congruent fight triangles in your ray diagram.)

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