以下为句子列表：
英文: Because the threshold exposure levels for photic damage to the retina at each wavelength of the optical spectrum are well known, it is fairly simple to calculate the maximum permissible filter transmittance that will provide adequate retinal protection fr
中文: 由于每种波长光线的极限值都已被测定,所以要计算出安全太阳滤镜最高允许透光率是很容易的.
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英文: The variation of optical spectrum of a special kind of optical fiber has been reported after γ-radiation, which may be used as a new kind of optical fiber filter.
中文: 摘要报导了2种结构的大芯径石英光纤在辐照后的光谱特性的变化，发现掺杂光纤在γ辐照后具有光学滤波作用，由此可利用这种特性研制一种新型的光纤滤波器。
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