1. Besides, index of double refraction can be also measured.

2. The initial or frozen - in double refraction is replaced by an equivalent or virtual state of stress.

3. Due to double refraction effect,() the ordinary ray and the extraordinary ray have different reflections.

4. Double refraction and linear polarization are the fundamental optical phenomena of anisotropic crystals, they are explained by using the electromagnetic theory.

5. Having one direction along which double refraction of light does not take place.

6. A photograph printing device arranges a pol aroid which can rot ate around an optic axis and a double refraction bo ard at the light emergent side of a liquid cryst all ayer.

7. The structure and properties of the fiber during multistage drawing were measured by double refraction , DSC and mechanical test.

8. We have deduced the formula used in determining the double refraction in synthetic fibre and given the experimental condition of determination.

9. The invention provides a formed optical forming body with small double refraction and excellent transparency and impact endurance test resistance.

10. Method for stretching polymer film, polarization diaphragm and method for making said polarization diaphragm, polarizer, double refraction diaphragm and liquid-crystal display device.

11. These phenomena indicated that, in the KCLO3 crystal the included angles between the electric vector vibration direction of double refraction light and of the incident linearly ...