This Is The High Double Refraction Rate Crystal Characteristic.

When this first-level characteristic is the light path difference is about 2O0nm

, the assorted wave length's light has certain brightness, mixes mutually becomes the white, calls the first-level white. First-level does Fords in the color not to have the discount sunglasses blue color and the green. The second level: The light path difference is 560-1120nm, the interference color is from low to high: Purple blue, green, olivine, orange-red isochromatic. Its characteristic is the color is bright, between the inked ribbon the boundary is clear. Third-level: The light path difference is 1120-1680nm, the interference color is from low to high:

Purple, blue, bluish green, olivine, yellow, orange, red. Its characteristic is inferior second-level bright, between inked ribbon's boundary is inferior second-level such clear. Fourth Level: The light path difference is above 1680nm, the interference color is from low to high: Purple ash, schungite, green ash, pale basket green, shallow orange-red, high-level white. Four level of interference color general cheap sunglasses online tones are very pale, between the inked ribbon is completely transits gradually, Not obvious boundary. When the light path difference increases to five levels above, the assorted light isometric's appearance, they do not mix become the approximate white tone the color, is called high-level white. If on calcite parallel optical axis slice, pair Refractive index No-Ne=0.172, when optical glass thickness rubs to 0.03mm, its light path difference R=d (No-Ne) =5160nm, presents the high-level white.

This is the high double sunglasses online australia refraction rate crystal characteristic. The interference color level foreword's height is decided In light path difference size, but the light path difference's size changes along with the optical glass thickness and the double refraction rate size, therefore the interference color level foreword's height should be decided by crystal optical glass's thickness and the double refraction rate. In standard thickness in because the 0.03mm optical glass, the identical crystal the slice direction is different, demonstrated the different interference color, the monoaxial crystal vertical optical axis slice's double refraction rate is equal to zero, assumes the entire extinction, not sunglasses online obviously interference color. Parallel optical axis slice pair The refractive index is biggest, has the highest interference color. Other direction slice's interference color is situated between the above both. Similarly, the biaxial crystal vertical optical axis slice is the entire extinction, the parallel plane of optic axis slice's interference color is highest, other

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