4-WAV-02
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Contents
Outcomes
- Pupils can state and use the Law of Reflection.
- Pupils can explain refraction as due to a change of speed in different media.
- Pupils can explain diffraction as the spreading of a wave around an object.
- Pupils can sketch different diffraction effects where λ << a; λ = a; λ >> a
Specification References
Starter
- Show pupils aerial photograph of Varna, Bulgaria and discuss the image. What wave effects are visible?
Main Body of Lesson
- Use small bulb, radiant heater, two parabolic mirrors, camera and temperature probe to demonstrate that heat waves are reflected just as light waves are.
- Pupils carry out practical work and complete Law of Reflection worksheet.
- Elicit a mathematical statement of the Law of Reflection from practical work.
- Use metal rod and parallel laser beam to demonstrate refraction.
- Pupils carry out practical work and complete Law of Refraction worksheet.
- Alternatively, pupils can carry out a virtual experiment, which is infinitely faster to set up and guaranteed to work.
- Use (decent, high power) laser and beaker/tank of water with fluorescein to redemonstrate refraction and introduce TIR.
Plenary
Homework
Additional Information
Resources Required
Textbook References
- Pople Chapter 6
- Pople 6.02 pp. 126-127
