Overview: Since Sorby published his observations on the structures of steels in 1863, the optical microscope has become one of the most widely used and versatile instruments for examining the structures of engineering materials. Moreover, to examine the diverse range of materials encountered, it must be used in both the reflected-light and transmitted-light forms, and with polarized light. It is complementary to, but not superseded by, the wide range of electron-optical instruments that are now used. Despite its extensive use, it has been described as the most misused, abused, and misunderstoo
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