Parallel rays of light strike a smooth metal sheet. The sheet is then scratched so that its surface becomes rough. Which explains the change in the reflected light?
the rays leave in different directions because the local normals change
the rays leave in different directions because reflection angles become zero
the rays remain parallel because each ray obeys the law of reflection
the rays remain parallel because the incident rays have not changed
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.