An art conservator illuminates a document with white light. Some of the white paper is covered by opaque blue ink. The conservator views the document through a colour filter. The ink looks almost black, while the uncovered paper looks red.
Which explains both observations?
the ink absorbs blue light, while the paper reflects blue light; the filter changes the reflected blue light to red
the ink reflects red light, which the filter absorbs; the paper reflects blue light, which the filter transmits
the ink reflects blue light, which the filter absorbs; the paper reflects red light, which the filter transmits
the ink reflects blue light, which the filter transmits; the paper reflects red light, which the filter absorbs
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.