A lens, by which the rays of the sun may be concentrated on an object, so as to burn it if combustible.
| 单词 | θ64930 |
| 释义 | the world > physical sensation > sight and vision > optical instruments > lens > [noun] > burning glass (4) burning-glass1570 A lens, by which the rays of the sun may be concentrated on an object, so as to burn it if combustible. sunglass1591 A lens for concentrating the rays of the sun so as to set light to combustible material. Cf. burning-glass, n. sunglass1801 A filter of darkened glass fitted to a sextant, telescope, etc., to reduce the intensity of the sun's light during observation. Now chiefly historical… burning-lens1831 |
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