http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/waves/generalwavesrev6.shtml
http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/waves/generalwavesrev7.shtml
Source: http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/waves
A short lesson introducing the basics of reflection
Source: Mrs G Boyson: http://www.knowmia.com/watch/lesson/45682
A revision video for GCSE science and P1 describing the law of reflection and how to construct a ray diagram for an object being reflected in a plane mirror.
Source: https://youtu.be/iUguHQMf0i8