When waves pass from one medium to another, or they meet a boundary, they can bounce back (reflection), change velocity (refraction) be absorbed or can pass straight through - depending on if the material is transparent, translucent or opaque.
Thanks for watching,
MY PHYSICS WEBSITES
Find even more videos organised by exam board and topic at:
GCSE Physics Online
A Level Physics Online
MY YOUTUBE CHANNEL
Your support in watching this video has been invaluable! To contribute towards the free videos on YouTube, make a small donation at: