Parallel rays of light pass through a concave lens.
Which statement about the principal focus is correct?
The rays meet at a principal focus on the opposite side from where the light enters
The rays meet at a principal focus on the same side of the lens as the light enters
The rays appear to come from a principal focus on the same side as the light enters
The rays appear to come from a principal focus on the opposite side of the lens
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.