Light transparent structure which is thin in middle and thick in its edges.
A lens such that a parallel beam of light passing through it is caused to diverge or spread out.
1She could already see its field, like a concave lens.
2It was a concave lens, like some powerful optical instrument.
3By means of a concave lens (L) the image may be made to fall on the retina (dotted lines).
4It distorted, as if that circle outlined the position of a concave lens, then it was gone, completely enclosed in a large silvery bubble.
5A concave lens has been substituted for the collimator and slit, and besides other advantages, a great saving in length is secured by this change.
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Translations for concave lens