IGCSE Physics: Core Practical — Investigating Refraction | Edexcel Modular | Unit 5 | L7

IGCSE Physics: Core Practical — Investigating Refraction | Edexcel Modular | Unit 5 | L7

This lesson covers spec points 5.17P and 5.19P — investigating the refraction of light using a glass block and determining the refractive index. Structured as a full core practical lesson.

PowerPoint includes:
• Retrieval starter reviewing reflection and light properties
• Safety and equipment briefing for ray box use
• Direct Instruction (I Do) — full practical procedure demonstrated step by step; correct angle measurement explained; common pitfalls highlighted
• Guided Practice (We Do) — collective data collection at three angles; data comparison with partner
• Independent Practice (You Do) — ray diagram construction from measured results; error and improvement analysis
• Expected results for i = 10°, 30° and 60° provided for reference
• Review and Reflect traffic light on practical confidence

Practical Activity Booklet includes:
• Section 1 — Aim and equipment (with writing space)
• Section 2 — 5-step method (numbered writing lines)
• Section 3 — Results table (i = 10°–60°, two trials, mean, i > r? check, comment)
• Section 4 — Ray diagram drawing space using i = 40° result
• Section 5 — Analysis questions with writing lines
• Section 6 — Conclusion comparing student results to accepted value n ≈ 1.5
• Full mark scheme for teacher use