positive crystal

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

(optics) A doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, such as quartz and ice; as opposed to negative crystal: one in which this characteristic is reversed, such as Iceland spar or tourmaline.

日本語の意味

（光学）二重屈折を示す結晶のうち、異常光線の屈折率が通常光線より大きく、異常光線が軸に近い方向へ屈折するタイプの結晶。例として石英や氷などがある。

英語の意味

(optics) A doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, such as quartz and ice; as opposed to negative crystal: one in which this characteristic is reversed, such as Iceland spar or tourmaline.

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In the lab, she identified the quartz sample as a positive crystal because its extraordinary ray was refracted closer to the axis than the ordinary ray.

実験室で彼女は、その石英試料が光学的に正の一軸性結晶であると判定した。つまり、異常光の屈折率が常光線より大きいため、異常光は常光よりも軸に近い方向へ屈折した。

詳細

意味（1）

(optics) A doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, such as quartz and ice; as opposed to negative crystal: one in which this characteristic is reversed, such as Iceland spar or tourmaline.

positive crystals （ plural ）