This exact control of optical phase is based on a unique combination of negative and positive refractive indices.
精确得控制光子相位是基于独特得组合负和正的折射率器件。
In normal optical fibres made from materials with positive refractive indices, this makes the effective thickness of the cable greater than its physical thickness.
在正常的用具有阳性折射指数制作的多个光导纤维中，这种情况会让电缆的有效厚度高于它的实际物理厚度。
The orientations of all developing facets in the crystals and their Miller indices have been determined by means of X-ray and optical method.
用X射线和光学方法测定了各个显露面，确定其密勒指数。
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