Also look out for readings in Bank of 4 Hope :)
Pinhole Cameras
http://en.wikipedia.org/wiki/Pinhole_camera
http://www.exploratorium.edu/science_explorer/pringles_pinhole.html
http://electronics.howstuffworks.com/question131.htm
Rainbow
http://en.wikipedia.org/wiki/Rainbow
http://www.cs.dartmouth.edu/farid/sciencekids/rainbow.html
http://www.highlightskids.com/Science/ScienceQuestions/h1scienceQuestion4.asp
http://www.myuniversalfacts.com/2006/04/how-rainbows-are-formed-what-causes.html
http://lifestyle.iloveindia.com/lounge/how-to-make-a-rainbow-2613.html
http://atozteacherstuff.com/Themes/Shadows___Light/
http://www.hunkinsexperiments.com/pages/shadowspartone.htm
http://www.kented.org.uk/ngfl/subjects/science/qca/lightandshadows.htm