Which statement is true for both convex lenses and concave lenses?
Both refract light because light changes speed in the lens material
Both bring parallel rays to a real focus on the far side of the lens
Both are thicker in the middle of the lens than they are at the edges
Both spread parallel rays out so they seem to come from one point
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.