Refractive index help Watch

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What does the second mark on this question mean?


Thank you in advance !
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Eimmanuel
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(Original post by GCSE pupil)
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Size:  29.8 KBName:  3A9BAF08-841D-4505-8C8E-183B70596EB6.jpg.jpeg
Views: 9
Size:  22.9 KB

What does the second mark on this question mean?


Thank you in advance !

https://www.youtube.com/watch?v=PWaNMjimtP0
The above video describes what is meant by pulse broadening. However, I am not sure why the person mentions that blue light travels faster and it seems to be an error.
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