Whereas modern optical mice work on most opaque dark field illumination allows mice to function reliably even on glass.
2.
Dark field illumination uses a carefully aligned light source to minimize the quantity of directly transmitted ( unscattered ) light entering the image plane, collecting only the light scattered by the sample.
परिभाषा
a form of microscopic examination of living material by scattered light; specimens appear luminous against a dark background पर्याय: dark ground illumination,
मोबाइल