Solution9. Investigation10. Group Activity11. Individual Work12. Resources13. Reflection
🧪 Interactive Investigation
Use PhET “Wave Interference” to explore two‐source interference in water:
👥 Collaborative Group Activity
In groups, design a simple microwave interference experiment (using slits and a detector) and report measured λ.
📝 Individual Assessment
- Explain why coherence is essential for stable interference fringes.
- Calculate fringe width for red light (λ=700 nm), a=0.3 mm, D=1.5 m.
- Determine second‐order angle for λ=500 nm on a 300 lines/mm grating.
- Discuss the effect of finite slit width on fringe contrast.
- Design an experiment to measure λ of a laser using double‐slit and grating methods; compare results.
🔗 Additional Learning Resources
🤔 Lesson Reflection
- Which interference experiment did you find most intuitive and why?
- How does slit separation affect fringe spacing?
- What practical limitations did you observe in your investigations?
- Set one goal to improve accuracy in wavelength measurement.