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tud623
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Hello All,
I am in need of an optics expert on imaging, and in particular a fresnel lens is being used as for an imaging device. From my understanding a condenser lens can be considered equivalent to a plano-convex lens.
Setup:
I am in need of an optics expert on imaging, and in particular a fresnel lens is being used as for an imaging device. From my understanding a condenser lens can be considered equivalent to a plano-convex lens.
Setup:
- A condenser fresnel lens is used, for which both the fresnel and plano conjugates are finite. Meaning these conjugates could be found using the thin lens equation. This only would apply if we wanted the light to focus to a point, which is not what we want.
- Light source projecting a pattern into the fresnel lens.
- Ideally the image produced should be similar to that of 25ft, when in actuality the source has only traveled approximately 3-4'.
- When comparing the pattern at the same distance without the lens, there is a clear difference.
- Image plane at the focal length, for which we should see a formed image.
- With initial testing, the size of the image stays the same no matter the light source location. The only thing that actually changes is the amount of the light source that is projected.
- What is the object being imaged? (The object is not the light source but rather it's projection?)
- How does this translate to the traditional thin lens formula?
- The image looks best when the image plane is at the focal length. Why is this this case for imaging a light source?
- Are there any articles/books that would be a good reference for imaging using fresnel lenses?
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