An instrument for measuring the density of a photographic negative or the opacity of a fluid.
| 单词 | θ76668 |
| 释义 | the world > matter > physics > electromagnetic radiation > light > [noun] > smallest unit of light > detection of > instrument for (2) photodensitometer1928 An instrument for measuring the density of a photographic negative or the opacity of a fluid. photodetector1947 A device that responds to incident light, esp. one whose operation depends on the electrical effect of individual photons. |
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