chanel coco rhinestone strass necklace vivienne westwood heart pendant anchor clasp pearl necklace chanel pearl floating cc charm silver necklace clic h sous le charme dorphee bracelet2918 bouton de camelia ring1930 hermes bermes darth vader bracelet o1xq perlee pearls of gold bracelet medium model 24049 dior star bee clover stacking rings 3 pieces b zero1 series earrings 38731 b7af7459 tiffany mini full diamond bow pendant necklace tiffany limited version round pendant necklace jadior stud pearl earrings lucky spring long necklace 15 motifs2768 dior minimalistic cd pendant gold chain necklace mini pop h necklace 148522 tiffany hardwear link necklace love bracelet classic model10 diamonds5682 trace chain 42 cm7496 b zero1 series ring 117190 vintage alhambra pendant 125991 coco crush ring 255060 chanel no 5 clover silver bracelet lucky spring between the finger ring9367 chanel no 5 bracelet cartier smooth surface love pendant necklace in rose gold chanel ear of wheat pearl flower bracelet tresse de coeur bracelet7297 bvlgari bvlgari collection necklace 146673 roulis double circle bracelet 109708 olympe ear clip small model 321222 divas dream bracelet 78627 bvlgari divas dream necklace n8hf magic alhambra earrings 2 motifs 22652 coco crush ring 305734 van cleef arpels diamond and rose red vintage alhambra bracelet 5 motifs bvlgari bvlgari collection necklace 159224 chanel black lace cc bracelet van cleef arpels perlee couleurs ring 5 rows olympe ear clip small model 149236 bvlgari serpenti viper necklace full diamond g56t 为什么铅笔伸jinshui就像是断了?_数理化之谜 - 棒子小说网
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为什么铅笔伸jinshui就像是断了?

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为什么铅笔伸进水就像是断了?

我们知dao光是沿着直线传播的。如果光从两zhong不同的wu质中通过,那么在这两zhongwu质jiao界的地方,光的传播方向会发生改变,这叫zuo光的折she1。光从空气进入水里,因为水比空气的密度大得多,于是,在水和空气相jiaochu1发生了折she1,不再沿着原来的方向传播。我们把铅笔伸进水中,我们见到的水下那bu分铅笔,是已经发生了折she1后的光线里的铅笔。这gu光线当然不会与水面的光线成一条直线,所以铅笔虽然没有断,而看起来却像是断了一样。

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