REFRACTION

BBC Earth (Asia) - - Science -

When a wave hits the bound­ary be­tween two ma­te­ri­als, trav­el­ling at an an­gle, it changes di­rec­tion. Light waves, for in­stance, are re­fracted when pass­ing be­tween wa­ter and air, mak­ing a straight ob­ject

ap­pear bent.

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