


What happens to a ray of light traveling along the principal axis after refraction/reflection?
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what is principal axis
- How is the focal length measured with respect to the principal axis?
- How does the principal axis relate to the design of eyepieces for telescopes and microscopes?
- What are confocal microscopes and how is the principal axis used in their operation and alignment?
- How does the concept of the principal axis extend to non-imaging optical systems like light pipes or waveguides?
- How does the principal axis relate to the Abbe sine condition and Herschel condition for aberration-free imaging?
- How does the presence of aberrations affect the ideal concept of a principal axis?
- How does the principal axis behave in a gradient-index lens?
- How is the principal axis used in optical instruments like telescopes and microscopes?
- What is the front vertex power of a lens and how is it related to the principal axis?
- How does the principal axis relate to the concept of optical invariants?
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