The results show that the chlorite jade is in dark green, semi-translucent to opaque, and lepidoblastic texture, with hardness of 2.5, refractive index 1.58 and density 2.60 g/cm^3. It has homogeneous texture and less fissures, and no fluorescence under ultraviolet fluorescence lamp. XRD analysis shows that the mineral composition of the chlorite jade is mainly chlorite.

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The "Lvlongjing" samples for the study have the unique dark green to celadon colour, lepidoblastic and foliaceous textures, density of 2.61~2.62g/cm^3, refractive index of about 1.57 and Mohs' hardness of about 2.5. The mineral component of the "Lvlongjing" sample is mainly composed of penninite-a subspecies of chlorite.

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It is difficult to be simulated and analyzed due to the excessive surfaces, complex structure and locomotory parts in zoom lens. All the transmission planes taken as the partial reflection and partial transmission planes were simulated with ASAP（advanced system analysis program）and the stray rays on "dangerous surfaces" which easily generate the ghost images in zoom lens were analyzed. Based on it, the zoom lens was optimized and the quality of image was improved by changing the curvature and refractive index of the second reflection planes.

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Er3+-doped (100-x)TeO2-xNb2O5 (x=5,10,15,20 mol%) niobic tellurite glasses were synthesized, and their density, refractive index, glass transition temperature, crystallization temperature, Vickers microhardness, absorption spectra, fluorescence spectra and the lifetimes of Er3+∶4I13/2 level were measured.

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Zirconium silicate has higher refractive index 1.93～2.01, enjoys sound chemical stability. It's a quality and cheaper opacifier finding widespread application in manufacturing various building ceramics, sanitarty ware,daily ceramic products,and high-quality ceramic products.

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Two factors, refractive index and reflective area related with the retroreflective capability are discussed.

從理論和實驗兩方面分析了玻璃微珠的回向反射特性在线观看所有免费AV网站，主要討論了玻璃微珠的折射率和其反射層面積這兩個因素對回向反射性能的影響。

The influence of the gap between the prism and negative-refractive-index film on the measurement is both theoretically and simulatively studied.

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It means that through tomographic detection of reconstructed image of double-exposure hologram the 3-D refractive index field has been measured.

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When using different refractive index of the glue, the light transmissivity is different.

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Lianghe turpentine relative density, refractive index, initial boiling point, distillation range size, optical activity and chemical composition as well as the softening point, acid value, unsaponifiable matter content, ethanol insoluble matter, ash, optical activity and chemical composition and other physical and chemical characteristics of rosin gum were studied.

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