6th Grade Sc: Refl vs refr

We see things because light reflects on them, but do all things reflect light the same way? And what about refraction? What is it and what can we do with it?
Check chapters 2 and 3 in your dossier and the links below and answer the quiz:
https://www.youtube.com/watch?v=Gr4if3vZXgw
https://www.youtube.com/watch?v=qbPfzOuIeSM
https://www.youtube.com/watch?v=OIf7Mnv92mg