Difference between revisions of "5-WAC-04 Total Internal Reflection / Refraction"
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* '''3.20''' describe the role of total internal reflection in transmitting information along optical fibres and in prisms | * '''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'' | * '''3.21''' recall the meaning of critical angle ''c'' | ||
| − | ==Starter== | + | ==Starter== |
| + | |||
==Main Body of Lesson== | ==Main Body of Lesson== | ||
* Remind pupils how to set up rayboxes. | * 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). | ||
==Plenary== | ==Plenary== | ||
==Homework== | ==Homework== | ||
Latest revision as of 08:10, 31 October 2010
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).
