| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: State that for reflection, the angle of incidence is equal to the angle of reflection; recall and use this relationship |
Learning Objective/s:
- Describe the law of reflection and the key terms (incident ray, reflected ray, normal, angles i and r).
- Explain how to apply i = r to find unknown angles in plane‑mirror problems.
- Identify and correct common misconceptions about measuring angles from the normal.
- Use accurate diagrams to locate images formed by plane mirrors using the law of reflection.
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Materials Needed:
- Plane mirror or reflective surface
- Protractor
- Ruler
- Whiteboard and markers
- Projector with slide of the reflection diagram
- Worksheet with practice questions
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Introduction:
Begin with a quick visual of a flashlight hitting a mirror to capture interest. Ask students how they would predict the direction of the reflected beam, linking to prior knowledge of angles. Explain that by the end of the lesson they will reliably use the relationship i = r to solve reflection problems.
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Lesson Structure:
- Do‑now (5 min): Students answer a short question on measuring angles from the normal versus the surface.
- Mini‑lecture (10 min): Review definitions and state the law i = r, using a projected diagram.
- Guided practice (15 min): Work through the provided example together, drawing the diagram and calculating angles.
- Independent practice (15 min): Students complete worksheet problems while the teacher circulates for feedback.
- Misconception check (5 min): Quick poll on common errors; discuss correct reasoning.
- Summary & reflection (5 min): Students write one key takeaway and submit an exit ticket with a new angle‑finding problem.
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Conclusion:
Recap the law of reflection and how it guides the construction of accurate ray diagrams. Collect exit tickets to assess immediate understanding, and assign a short homework task: complete three additional reflection problems from the textbook. Remind students that mastering i = r will help them with image location in mirrors and future optics topics.
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