A card has a white area and a red area. The red area reflects only red light. White light passes through a filter and illuminates the card. The white area appears blue and the red area appears black. Which explains both observations?
the filter transmits blue; the white area reflects it and the red area absorbs it
the filter transmits red; the white area absorbs it and the red area reflects it
the filter transmits blue; the white area absorbs it and the red area reflects it
the filter transmits red; the white area reflects it and the red area absorbs it
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.