Assertion: microscope's specimen | /r/HasProperty | dark
Facets:
value: against a bright background
type: OTHER
Source sentences:
text: - bright white light which illuminates a transparent or translucent specimen which appears dark against a bright or white background.
text: As its name implies, when you observe a specimen under a bright field microscope, the specimen will look dark and its field will look bright.
text: The specimen is illuminated by a beam of tungsten light focused on it by a sub-stage lens called a condenser, and the result is that the specimen appears dark against a bright background.