Parallel rays of light pass through a convex lens.
What happens to the rays?
They converge and meet at the principal focus
They spread apart and appear to come from a point
They stay parallel but move closer to each other
They are reflected back towards the light source
51 exam-style questions on OCR GCSE Physics 5.3 Wave interactions, covering 5.3.1 Wavelength and how substances affect waves, 5.3.2 Wave velocity in different substances, 5.3.3 Convex and concave lenses, 5.3.4 Ray diagrams for reflection and refraction, and 5.3.5 Colour, absorption and reflection. Each one has a worked solution and a mark scheme showing where the marks go.