The refractive index was obtained through measuring the focal position of a capillary filled with the liquid by a reading microscope, and doing a calculation with an analytic formula.
该方法基于共轴球面光学系统的成像原理，通过读数显微镜对吸入待测液体后毛细管的焦点位置进行单一参数的测量，进而计算出待测液体的折射率。
The results of verifying calculation show that the analytic formula has smaller computational error as compared with computer numerical arithmetic, and therefore it is practical.
验证计算结果表明：解析公式与计算机数值计算法结果相比较，计算误差小，具有实用价值。
The results obtained by using the analytic fitting formula and numerical calculation agree well with each other.
解析拟合公式计算结果与数值模拟结果较为一致。
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