A student shines a ray of light through a glass prism and marks the path of the ray on paper.
Which method gives the most accurate path for the ray?
Mark the ray with two crosses far apart, then join them with a ruler
Mark the ray with two crosses close together, then join them with a ruler
Draw along the ray freehand while the ray box is still switched on
Repeat the whole experiment three times and use the mean angle
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.