IGCSE Physics: Properties of Light & Reflection | Edexcel Modular | Unit 5 | L6

This lesson covers spec points 5.9, 5.14, 5.15 and 5.16 — light as a transverse wave, the law of reflection, ray diagram construction, and specular vs diffuse reflection.

PowerPoint includes:
• Retrieval starter reviewing EM spectrum and wave types
• Direct Instruction (I Do) — law of reflection stated; key terms defined; step-by-step ray diagram construction method
• Guided Practice (We Do) — three ray diagram problems: basic angle, misleading surface angle, virtual image location
• Independent Practice (You Do) — law of reflection question; angle calculation; specular vs diffuse explanation; periscope construction task
• Misconception check: does diffuse reflection obey the law of reflection? (true/false with reasoning reveal)
• Summary word-fill on image properties in a plane mirror
• Review and Reflect traffic light on ray diagram accuracy

Activity Sheet includes:
• Results table for reflection practical (i = 10°–50°, two trials, mean, i = r? check)
• 10 exam-style questions plus stretch covering law of reflection, angle calculations, specular/diffuse, and periscope
• Q6 and Q10 include blank drawing spaces for ray diagram construction
• Stretch question addresses the diffuse reflection misconception
• Full mark scheme for teacher use