The word concave lens
MOST NEARLY means:
  1. Transparent object that has at least one curved surface that causes light to bend.
  2. Has electromagnetic radiation that has wavelengths shorter than those of the visible light spectrum, but longer than those of an x-ray.
  3. Point on the optical axis of a mirror or lens where the rays traveling parallel to the optical axis pass through.
  4. Lens that is thicker around the edges than in the middle.
  5. Complete range of electromagnetic wave frequencies and wavelengths.
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