A spotlight in a theatre produces white light. A technician puts a green filter in front of the spotlight.
Explain how the filter produces green light from white light.
The green light shines on an actor wearing a white shirt and a red hat.
Give the colour of the shirt and the colour of the hat seen by the audience.
The technician places a red filter in front of the green filter.
Explain what the audience sees where the spotlight was shining.
Explain why the green filter becomes warm when the spotlight is switched on.
93 exam-style questions on Edexcel GCSE Physics 5.1 Reflection, refraction and lenses, covering 5.1.1 Reflection, refraction and total internal reflection, 5.1.2 Specular and diffuse reflection, 5.1.3 Colour of light: absorption and filters, 5.1.4 Lenses: power, focal length and shape, 5.1.5 Ray diagrams for converging and diverging lenses, and 5.1.6 Real and virtual images. Each one has a worked solution and a mark scheme showing where the marks go.