Definition of Rayleigh limit in US English:

Rayleigh limit

noun

Physics
  • 1The upper limit of a quarter of a wavelength placed on the difference between the optical paths of the longest and shortest rays of those going to form an image in order that the definition shall be close to the ideal.

  • 2The limit on resolving power arising from the Rayleigh criterion.

Origin

1920s; earliest use found in Transactions Optical Society.