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我國在戰國時代,墨子已研究了光的反射定律。後因继起无人,就成了絕学。到十九世紀,在歐洲却有高斯(Gauss)、賽德耳(Seidel)、亞倍(Abbe)等,把幾何光學深入研究,經過他们的研究後,透鏡系像質的各項缺陷,其原因大为明瞭。這些缺陷,大部可用透鏡曲率及距離來校正,結果为光學儀器開闢了一條光明道路。於是光學玻璃品質的匀净及種類的扩增,其要求就日益迫切了。在1886年以前光學玻璃僅限於冕牌和火石兩類。冕牌玻璃就是鈉鈣矽酸玻璃,
In the Warring States Period in our country, Mozi studied the law of reflection of light. After the successor to no one, it became a must-see. In the nineteenth century, there were Gauss, Seidel, Abbe and others who studied geometrical optics in depth. After their research, all the defects of lens system quality, The reason is clear. Most of these defects can be corrected with lens curvature and distance, opening up a bright path for optical instruments. So even the purity of optical glass and the type of amplification, its requirements are increasingly pressing. Before 1886, optical glass was limited to both crown and flint. Crown glass is sodium calcium silicate glass,