名词
中文翻译：主要折射率指数
同义词：
['principal refractive index', 'principal index of refraction']
例句：
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1. The new lens technology has improved the principal refraction index of the eyeglasses.
这项新的透镜技术已经提高了眼镜的折射率。
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2. The scientist used a prism to measure the principal refraction index of the light.
科学家使用棱镜来测量光的折射率。
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3.With the advancement of technology, the principal refraction index of lenses has been reduced.
随着科技的进步，镜片的折射率已经降低。