Click on the image above.

For some ideas on where to start with the optical fibre questions try the following links.

http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel_pre_2011/waves/sendinginformationrev1.shtml

http://www.optics4kids.org/home/futurescientists/advanced/total-internal-reflection/

http://curiosity.discovery.com/question/fiber-optic-cables-work