div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: · Optically 1538 Optically na 1538 Note that 1538 is atx»ut the same as the index of refraction of many but not all commonly used thin cements src=https:reader034fdocumentsnetreader034viewer20220505165fa0748071a2a114fb0acb97html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: · Optically 1538 Optically na 1538 Note that 1538 is atx»ut the same as the index of refraction of many but not all commonly used thin cements src=https:reader034fdocumentsnetreader034viewer20220505165fa0748071a2a114fb0acb97html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=trans-pagebuttonPage 3button div class=trans-image amp-img class=trans-thumb alt=Page 3: · Optically 1538 Optically na 1538 Note that 1538 is atx»ut the same as the index of refraction of many but not all commonly used thin cements src=https:reader034fdocumentsnetreader034viewer20220505165fa0748071a2a114fb0acb97html5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdiv