Title Text:They often use ball lenses to collect light at the ends of optical fibers, so when you look stuff up on the internet you’re actually scrying through a crystal ball. Origin:https://xkcd.com/2776/ https://www.explainxkcd.com/wiki/index.php/2776:_Crystal_Ball 水晶球 巫师们经常使用球形透镜来收集光纤末端的光线，所以你上网的时候实际上是在通过水晶球占卜。 http://xkcd.in/comic?lg=cn&id=2776 在光学中，球面像差是由于光线在击中球面镜片边缘时的… Read more