An improved immersion method for refractive index determinations on small transparent particles such as glass fragments is described. The method features accurate match point determinations coupled with accurate and convenient control of the refractive index of the immersion liquid. A Mettler Hot Stage is utilized to vary the refractive index of the liquid by changing its temperature. The point at which the liquid and particle match is sensitively determined using the phase contrast microscope. This technique is discussed in relation to older immersion methods.
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