CAIE IGCSE Physics 3.2.2.4 Meaning of critical angle
Practise stating the critical angle clearly and recognising it on diagrams where a ray in a denser medium reaches a boundary.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- state the critical angle as the angle of incidence giving a refracted ray along the boundary
- identify the critical angle condition on a ray diagram from a denser medium
3.2.2.4—Meaning of critical angle question 1
Fig. 6.1 shows part of an optical fibre used in high-speed broadband communication.
Fig. 6.1
State the meaning of critical angle.
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