Numerical aperture (NA) is a dimensionless figure that characterizes the range of angles over which a lens can accept or emit light. It is a critical parameter in microscopy and optics, particularly when discussing the resolution and light-gathering ability of lenses.

Ancestors (6)

  1. Dimensionless numbers
  2. Numbers
  3. Arithmetic
  4. Fields of mathematics
  5. Mathematics
  6. Home

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