An opaque badge is illuminated by white light from the same lamp in two separate tests. A red filter is placed between the lamp and the badge in the first test, and a blue filter is used in the second test. The badge looks bright red in the first test and very dark in the second test.
Which explains the observations?
the badge reflects red light and absorbs most other visible wavelengths
the badge reflects red and blue light and absorbs most other visible wavelengths
the badge reflects most visible wavelengths, including red and blue light
the badge reflects blue light and absorbs most other visible wavelengths
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.