| 单词 | extension lens |
| 释义 | > as lemmasextension lens extension lens n. a lens that may be used in a combination to increase its focal length (see quot.). Π 1902 Nature 17 July 280/1 The replacement of the back component by a lens of greater focal length, increasing the focal length of the objective by about 50 per cent. we referred to some time ago, the alternative back lens being known as an ‘extension lens’. < as lemmas |
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