CAIE IGCSE Physics Dispersion by a Glass Prism
Practise tracing coloured rays through both faces of a prism and explain white-light separation through the different speeds and refractions of each colour.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- draw blue or violet bending more toward the normal in glass and more than red
- continue each ray away from the normal on exit while increasing colour separation
- explain that glass gives different colours different speeds, indices and refraction angles
3.2.4.1—Dispersion of light as illustrated by question 1
Fig. 6.1 shows white light incident at point X on a glass prism.
Fig. 6.1
From point X on Fig. 6.1, draw a ray of red light, labelled R and a ray of violet light, labelled V, to show how a spectrum is formed on the screen.
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