How To Use Field lens In A Sentence

• He had introduced a field lens, a third lens between the objective lens and the eye-piece, which served to increase the field of view.
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• The effect of field lens in infrared optical systems is discussed.
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• Use magnetic field lens again, two kinds of electron lens elaborate respectively below form and principle.
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• Another classic application of the field lens is in a periscope or endoscope.
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