| 单词 |
bispheric darkfield condenser |
| 释义 |
bispheric darkfield condenser bispheric darkfield condenser A dark-field condenser consisting of a convex spherical reflector mounted concentrically with a larger concave reflector. Light rays diverge into a cone via a convex reflector; an annular concave reflector then forms a hollow converging cone which is focused on the subject matter of interest. |
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