What is the focal length of a concave lens?


According to the sign convention, the focal length of a concave lens is always negative.

Concave lens

  • A concave lens is a type of lens that diverges a straight light beam from the source into a diminished, upright, virtual image.
  • It has the ability to create both real and virtual images. At least one inside surface of concave lenses is curved.
  • A diverging lens is a concave lens that is made round inwards in the middle and bulges outwards through the corners, causing light to diverge on it.
  • They’re used to treating myopia because they make faraway items appear smaller than they are.

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