A demonstration of how a source of light is required to see objects in the dark. The presenter shines a torch around a dark room and sees shiny and white objects. The presenter also shows Boffin the cat's eyes shining in the dark. She then turns the torch off and we cannot see anything - a source of light is required to see in the dark. The presenter goes on to explain that Boffin's eyes do not actually glow in the dark and that they are simply reflecting the light from the torch.

This clip is from:
Science Clips, How We See Things
First broadcast:
12 October 2007

Ask the class to watch the clip as a way of introducing the topic of light and dark and use as a stimulus for discussion about how we need light to see. Following the clip, pose the question to the class - is it better to have a disco in a light or dark room? Allow them to test out this question using knowledge gained from the clip. The question and investigation could be further extended by asking what if the dark room only had reflectors or only had light sources?