Year 8S1 Homework :
Revise for your end of unit test on light and sound.

Work through the Refraction section 29, learning then try the test at the end.
Let me know you score and anything you didn't understand.
http://lgfl.skoool.co.uk/keystage3.aspx?id=93

You can also use the KS3 power points 8K Light and 8L Sound to revise.
Have fun!