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| − | ==Outcomes==
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| − | * Pupils understand the phenomenon of total internal reflection.
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| − | * Pupils understand the role of critical angle in TIR.
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| − | * Pupils recall uses of TIR.
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| − | ==[[Specifications|Specification]] References==
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| − | * '''3.14''' recall that light waves are transverse waves which can be reflected, refracted and diffracted
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| − | * '''3.20''' describe the role of total internal reflection in transmitting information along optical fibres and in prisms
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| − | * '''3.21''' recall the meaning of critical angle ''c''
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| − | ==Starter==
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| − | ==Main Body of Lesson==
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| − | * Remind pupils how to set up rayboxes.
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| − | * Hand out rectangular blocks.
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| − | * Have pupils try to get a beam to "reflect inside the block". This shouldn't take long.
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| − | * Collect in rectangular blocks and replace with semicircular prisms.
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| − | * Have pupils line up ray of light so that angle of incidence is 0°ree; and then rotate through 90°ree;, maintaining the "exit" point of the ray as centre of the flat side of the prism (this makes more sense with a diagram).
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| − | ==Plenary==
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| − | ==Homework==
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| − | =Additional Information=
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| − | ===Resources Required===
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| − | ===Textbook References===
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| − | ===Website References===
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| − | ===Skills Addressed===
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| − | ===Safety/Hazards===
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| − | ===Notes===
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