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Edexcel IGCSE Physics 3.20 Total Internal Reflection Questions

Total internal reflection occurs when light in a higher-index material reaches a lower-index boundary above the critical angle. Repeated internal reflections keep light in an optical fibre or prism.

Syllabus
First assessment 2019
Course
Physics 4PH1

Exam points

  • Explain total internal reflection when light travels from a higher- to a lower-refractive-index medium and the angle of incidence exceeds the critical angle.
  • Explain how repeated total internal reflection guides light along an optical fibre or reflects it within a prism; at each reflection, the angles of incidence and reflection are equal.

Edexcel IGCSE Physics 3.20 Total Internal Reflection Questions question 1

[Maximum number: 2]

This question is about refraction.

The torch is moved below the surface of the water. Light from the torch is incident on the water surface at an angle greater than the critical angle.

A ray of light leaves the torch as shown in the diagram.

Complete the path of the ray of light.

Figure for Question Edexcel IGCSE Physics 3.20 Total Internal Reflection Questions question 1 — Edexcel IGCSE Physics
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