Light Interactions

Overview

Students investigate how light behaves when it encounters different materials, focusing on absorption, reflection, refraction, and scattering. Using laptops, students run a guided simulation and then analyse their own evidence to explain observed patterns.

Learning intentions

• Students will describe how light interacts with materials through absorption, reflection, refraction, and scattering.
• Students will plan and follow a procedure for a safe, valid and reliable investigation using laptop-based data collection or simulations.
• Students will represent observations using tables/graphs and select appropriate evidence to support a scientific explanation.
• Students will communicate a scientific argument using scientific language and clear reasoning.

Success criteria

• I can identify which interaction (absorption, reflection, refraction, scattering) is occurring and justify why.
• I can use evidence from a simulation or laptop data to support my claims.
• I can use correct terms (ray, incident angle, normal, refracted ray, surface, beam) in my explanations.
• I can describe one limitation of my evidence and how it could be improved.

Curriculum links

• SC5-WS-04: follow a planned procedure to undertake safe, ethical, valid and reliable investigations.
• SC5-WAM-01: describe features and applications of different forms of waves, including light behaviour.
• SC5-WS-05: select and use tools to process and represent data.
• SC5-WS-08: communicate scientific arguments with evidence using scientific language and terminology.

Lesson structure (60 minutes)

1. 0–6 min · Hook and recall. Teacher displays the light interactions hook and content deck and asks: “Why do sunglasses reduce glare but still let you see?” Students think-pair-share and jot initial ideas on the light interaction investigation worksheet.

2. 6–14 min · Direct teach (micro-lesson). Teacher uses the light interactions hook and content deck to model each interaction: absorption (energy transfer), reflection (angle of incidence vs reflection), refraction (bending due to speed change), scattering (spreading in all directions). Students copy a simple “If…then…” matching sentence frame for each interaction.

3. 14–20 min · Investigation setup with laptops. Teacher introduces the laptop task using the light interactions hook and content deck: students will run a guided simulation or digital light-behaviour activity, record observations, and then compare outcomes across materials/conditions. Students check their plan/procedure against a checklist on the light interaction investigation worksheet (inputs, variables, what to record, how many repeats).

4. 20–38 min · Laptop investigations (data collection). Teacher circulates, reminding students to keep conditions consistent to improve validity/reliability and to record data in a structured table. Students use laptops to run trials for at least two scenarios each:

• Reflection: different surface types or angles
• Refraction: entering a new medium and measuring/recording angles
• Scattering: beam through a “rough/particle” medium Students record results and short qualitative notes on the light interaction investigation worksheet.

5. 38–48 min · Evidence processing and pattern finding. Teacher returns to the light interactions hook and content deck and prompts: “What stays the same, what changes, and what is the interaction doing to the light?” Students convert key results into a simple comparison table and circle the best evidence for each interaction on the light interaction investigation worksheet.

6. 48–56 min · Scientific argument (mini-claim-evidence-reasoning). Teacher models one example response using scientific language on the light interactions hook and content deck (claim → evidence from their table → reasoning using correct terms). Students write a short CER paragraph answering: “Which interactions explain the behaviour of light in the real-world context from the hook?” on the light interaction investigation worksheet and include one limitation.

7. 56–60 min · Plenary and exit check. Teacher runs a quick class poll from the light interactions hook and content deck: students hold up fingers (1–5) for confidence that they can identify each interaction, then complete a 1-sentence exit reflection on the light interaction investigation worksheet: “One piece of evidence I trust most is…”

Resources

• the light interactions hook and content deck (single deck for hook, content, instructions, prompts, and plenary)
• the light interaction investigation worksheet (data table + analysis + CER)
• Student laptops with access to a light-interaction simulation/activity
• Teacher checklist for validity/reliability prompts (can be on slides or displayed board-side)
• Pens/pencils and highlighters
• Optional: headphones for students needing quiet during laptop simulation

Assessment

• Formative during investigations: teacher checks that students record consistent variables and repeat trials.
• Formative during processing: teacher reviews tables/graphs for accuracy and appropriate representations.
• Summative-in-practice: CER paragraph evaluates scientific argument quality and use of terminology with evidence.
• Exit reflection checks conceptual mastery of absorption/reflection/refraction/scattering.

Differentiation

• Support: provide sentence starters for CER (Claim: … Evidence: … Reasoning: …) and a word bank on the light interaction investigation worksheet.
• Support: offer a “ready-made table format” for students who need structure; allow them to focus on fewer scenarios (still recording at least two interactions).
• Extension: challenge students to explain one application (e.g., anti-glare coating, lenses, safety vests/retroreflectors) using evidence from their results.
• EAL/SEN: allow bilingual glossary support and accept qualitative descriptions alongside quantitative records; highlight key terms consistently on the light interactions hook and content deck.