Valon kulku (kampa) https://www.youtube.com/watch?v=p0-qWezLn2A
Katoava pilli https://www.youtube.com/watch?v=DY-nL1ce4Xo
Valot ja värit https://www.youtube.com/watch?v=-98YzumXBZE

Heijastin https://www.youtube.com/watch?v=BF6sE7vJnDg
Heijastinlaulu https://www.youtube.com/watch?v=BWkN0bS6fQg
Ransun heijastinkoulu https://www.youtube.com/watch?v=OPJxyaIqhow

Prisma https://www.azooptics.com/Article.aspx?ArticleID=723
Miten sateenkaari muodostuu https://www.youtube.com/watch?v=nCPPLhPTAIk

DR Binocs show
Light https://www.youtube.com/watch?v=d7yTlp4gBTI
Shadow https://www.youtube.com/watch?v=lOIGOT88Aqc
Light and shadow https://www.youtube.com/watch?v=fy7eoMef3e8

What is a prism https://www.youtube.com/watch?v=nHCKRGBxlf8
How is a rainbow formed https://www.youtube.com/watch?v=nCPPLhPTAIk

How to see sound https://www.youtube.com/watch?v=37csXse35YQ
What is sound https://www.youtube.com/watch?v=gdGyvGPZ1G0
Guitar sound waves https://www.youtube.com/watch?v=K5pG3Y9OaAY
Sounds bottles (+äänirauta) https://www.youtube.com/watch?v=ej9QAaS7apg
How do drums make sound https://www.youtube.com/watch?v=1a1cCvGiUww