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| German | English |
| kritische Beleuchtung | critical illumination (method of microscopical illumination in which an image of the source is focussed by the substage condenser in the plane of the specimen) |
| kritische Blende | critical aperture (the aperture or stop opening at which maximum resolution occurs) |
| kritische Frequenz | critical fusion frequency |
| kritische Frequenz | flicker-fusion frequency |
| kritische Frequenz | critical flicker frequency |
| kritische Spaltbreite | critical slit width (slit width below which no increase in resolution can be observed) |
| kritischer Winkel | critical angle (total internal reflection) |
| kritisches Beleuchtungssystem | critical illumination system |
| Verlauf der kritischen Isotherme | curve of the critical isotherm |