- Ask pupils to explore how coloured filters affect light,
eg by producing a spectrum and allowing this to pass through filters of different colours; by passing white light through one filter and then through a second filter.
- Remind pupils of their earlier work on absorption and transmission of light, and on the nature of coloured light as demonstrated by the spectrum. Ask pupils to explain why light appears to change colour as it passes through.
- Establish the idea that coloured filters will only transmit light of certain colours, the other colours being absorbed, and help pupils illustrate this with annotated diagrams.
- Demonstrate, using an overhead projector (OHP), software or video clips, how the primary colours of light can be combined to produce white light, and briefly discuss the relevance of colour vision and the production of coloured pictures on television.
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- investigate how coloured filters change white light
- suggest how filters affect white light
- investigate how coloured light can be combined to produce new colours
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