Figure 5-9 (adapted) from Bloss, Donald, (1999). Optical Crystallography, 40. Mineralogical Society of America— Free (Digital Product)
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AUTHOR
Wayne Moorehead
DESCRIPTION
Identification of unknown particles using the immersion method with a polarized light microscope was taught in a tier one university forensic microscopy course using Optical Crystallography* by F. Donald Bloss as the foundational text for understanding the theory of optical properties observed in the microscope. A chart from the text, Figure 5–9, was confusing to students. By inverting the chart, the students’ observations of optical properties appeared more consistent with the information contained in the chart. Thus, this revised, inverted chart is more useful toward determining the refractive index of an unknown particle.
*Bloss, F. D. Optical Crystallography, Mineralogical Society of America, Washington D.C. 1999