CAIE IGCSE Physics Normal and Refraction Angles
Practise drawing the normal at a boundary and identifying incidence and refraction angles from that normal rather than from the material surface.
- Syllabus
- 2026–2028
- Course
- Physics 0625
Exam points
- draw the normal perpendicular to the boundary at the point where the incident ray arrives
- measure incidence and refraction angles between each ray and the normal, not the surface
3.2.2.1—Terms normal, angle of incidence and question 1
A ray of light is incident on a soap film. Fig. 5.1 shows a magnified image of a small part of the soap film. The ray of light is refracted as it enters the soap film.
soap film
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air
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The refractive index of the soap film is 1.28 .
On Fig. 5.1, carefully draw the refracted light ray in the soap film and label the angle of refraction.
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