LuduminaWA-04 · WA-U2 · Planned
Reflection and material interfaces
Learning objectives
Draw reflection rays and normal; distinguish reflected, transmitted and absorbed energy.
8463 §§4.6.1.3 / No Trilogy counterpart
DfE single-science pp.37–39 / Combined pp.32–33. Evidence checked 30 September–1 October 2026. Skills: WS1.2,2.6; MS5a,5c.
Explanation
The normal is perpendicular to the surface at the point of incidence. Reflection angles are measured from that normal. At a material boundary, incident energy may be divided between reflection, transmission and absorption rather than all reflected.
Concepts, equations and units: Angles from normal in degrees; incidence angle=reflection angle; ray and wavefront representations differ.
Prediction, demonstration and game exercise
Predict, observe, explain
Send waves to a boundary and compare smooth/rough surfaces; annotate energy partitions.
Planned learner game exercise
Orient mirrors to send a beam to a receiver; compare reflective and absorbing materials.
Independent practice
Two ray-diagram problems and an interface explanation; record angles in a table.
Original practice example · Separate Physics
A ray arrives at 35° to the normal of a mirror. State its reflection angle.
Show working and model answer
Working / reasoning
For reflection, angle of incidence equals angle of reflection, both measured from the normal.
Answer
35° to the normal.
Exit check and success criteria
Both ray constructions within 2° target tolerance and all three outcomes distinguished.
During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.
Misconceptions, practical links and mastery
Check these misconceptions
Angles measured from surface; every boundary reflects all incident energy; diffuse reflection breaks reflection law.
Practical preparation
RP-P9 reflection part; AT4,8.
Virtual preparation and revision only. Required hands-on activities and school records remain separate.
Proposed mastery
0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.