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I was asked the question in the title some time ago.
The student suggested a YouTube video by prof.
Merrifield: <https://www.youtube.com/watch?v=CiHN0ZWE5bk>
Here is another related video on refraction by prof. Moriarty:
<https://www.youtube.com/watch?v=YW8KuMtVpug&feature=youtu.be>
Here'sa good explanation by Paul Hewitt:
https://www.youtube.com/watch?v=6fSf0lfRLKY