5WACS-4
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Revision as of 16:17, 30 October 2011 by Mrsaunders (Talk | contribs) (New page: ==Outcomes== * Pupils understand the phenomenon of total internal reflection. * Pupils understand the role of critical angle in TIR. * Pupils recall uses of TIR. ==[[Specifications|Specifi...)
Contents
Outcomes
- Pupils understand the phenomenon of total internal reflection.
- Pupils understand the role of critical angle in TIR.
- Pupils recall uses of TIR.
Specification References
- 3.14 recall that light waves are transverse waves which can be reflected, refracted and diffracted
- 3.20 describe the role of total internal reflection in transmitting information along optical fibres and in prisms
- 3.21 recall the meaning of critical angle c
Starter
Main Body of Lesson
- Remind pupils how to set up rayboxes.
- Hand out rectangular blocks.
- Have pupils try to get a beam to "reflect inside the block". This shouldn't take long.
- Collect in rectangular blocks and replace with semicircular prisms.
- 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).