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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.
Origin of field lens
1830-1840
1830-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Difficulty index for field lens

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Word Value for field

9
10
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