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The numerical aperture of a microscope objective defines the objective's resolution. Each microscope objective has a minimum and maximum magnification necessary for the details in an image to be resolved. A simple formula for the minimum value is (500 x NA). And for the maximum magnification (1000 x NA).
A microscope (from the Ancient Greek: Î¼Î¹ÎºÏÏÏ, mikros, mikrÃ³s small and, ÏÎºÎ¿ÏÎµá¿Î½, skopein skopeÃ®n to look) or see is an instrument used to see objects that are too small for the. Naked eye the science of investigating small objects using such an instrument is. called microscopyn the early 20th century a significant alternative to light microscopy was developed, using electrons rather than light to generate the image. Ernst Ruska started development of the first electron microscope in 1931 which was the transmission electron microscope (TEM).