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field lens

noun

, Optics.
  1. the lens in an eyepiece that is farthest from the eye and that deviates rays toward the center of the eye lens.

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Word History and Origins

Origin of field lens1

First recorded in 1830–40

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Example Sentences

The equivalent focal length of a negative or Huygens eyepiece is equal to half the focal length of the larger or field lens.

The object looked at requires to be a short distance in front of the field-lens.

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