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Lesson 11 - Total internal reflection
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Objective
This lesson combines the concepts from the previous two to describe total internal reflection. The lesson is introduced with reference to Kepler and his work on optics and concludes with a discussion of how optical fibres carry information.
Prescribed Focus Area Skills Development Content

P1 A student outlines the historical development of major principles, concepts and ideas in physics.
P2 … applies the processes that are used to test and validate models, theories and laws of science with particular emphasis on first-hand investigations in physics
P4. … describes applications of physics which affect society or the environment

P12.1 Students perform first-hand investigations
P12.2 … gather first-hand information
P12.4 … process information
P14 … draw valid conclusions from gathered data and information

D4.7 Students learn to identify the conditions necessary for total internal reflection with reference to the critical angle; and
D4.8 … outline how total internal reflection is used in optical fibres

Activity Resources Homework

Students perform a first-hand investigation of total internal reflection including a measurement of critical angle for glass or perspex. The measured angle is compared with a predicted value using the refractive index measured in the previous lesson.

  • Laser or other suitable light source
  • Glass and/or perspex prism(s)
  • Protractors
  • Graph paper

 
Management issues Nominal duration
 
2 hours

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