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用矿相显微镜观察时,在单偏光镜下矿物反射光强与入射光强之比为“反射率”,用R表示。对于处于任意位的非均质矿物,则用R_ψ示。在正交偏光镜下,相应光强之比为“正交反射率”,用R_+表示。分析镜已推入,但它的方向与起偏镜(前偏光镜)严格平行时,相应的光强之比为“平行反射率”,用符号R_(∥)表示。早在卅年代,贝瑞克(M.Berek)就已提出平行反射率的概念,并推导出了它与物台旋转角ψ及矿物折射率N、吸收系数K关系的公式。由于重视不够,以及当时的目视测反射率的光度计精度不足,平行反射率R_(∥)虽然是一项容易测定和利用的光学常数,
Observation with a mineral microscope, the single-polarized light reflectance mineral and incident light intensity ratio of “reflectivity”, with R said. For any heterogeneous minerals in place, use R_ψ. In the orthogonal polarizer, the ratio of the corresponding light intensity “orthogonal reflectivity”, with R_ + said. Analytical mirror has been pushed in, but its direction is strictly parallel to the polarizer (front polarizer), the corresponding ratio of light intensity is “parallel reflectivity”, with the symbol R_ (∥) said. As early as 1930s, M. Berek had proposed the concept of parallel reflectivity and deduced the formula of its relationship with the rotation angle ψ of the platform and the refractive index of mineral N and the absorption coefficient K. Due to the lack of attention and the lack of accuracy of the visual reflectometer at that time, the parallel reflectance R_ (∥) is an easy to measure and use optical constants,