3 ms·

I believe the author showed up in the comments on the Ars version of the article [0] and touched on some of these ambiguities. [0] https://arstechnica.com/spac

• kristianp 3y ago
  One of the comments (from user Wickwick) explains the difference concisely: > I was going to make a small adjustment to the post on this topic. The lenses Fresnel designed were refractive (and reflective) and not diffractive. In fact, it's the diffraction of the transitions that ruins the image quality of these sorts of lenses.
  • venusenvy47 3y ago
    This is what I understand is the drawback of a Fresnel lense. The article is written in first person, but I can't find the name of the author anywhere around the article.