A microscope (from the Greek: μικρός, mikrós, “small” and σκοπεῖν, skopeîn, “to look” or “see”) is an instrument for seeing objects that are too small to see by the naked eye. The early microscopes were really only magnifying glasses had one power, usually about less than 10X . They were also called “simple microscopes”. The Dutch spectacle-makers Zacharias and Hans Janssen of Middelburge invents “compound microscope” in 1595 capable of magnifying specimens up to ten times when fully extended. Early compound microscopes were very inefficient and the image quality was affected by significant chromatic and spherical aberration. Today’s compound microscopes have much better optical quality and more sophisticated as many new technologies are introducted into microscopy, such as fluorescent, confocal and electron microscopy.
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