SP4c Refraction | Edexcel GCSE Physics Separate Science Topic Mastery Pack

A complete revision and exam practice pack for SP4c Refraction, covering the full Pearson Edexcel GCSE Physics (9–1) Separate Science specification for this topic. Higher tier explanation of refraction (P4.10H) is included.

This pack contains three components:

Topic Mastery Sheet (PDF) - a comprehensive reference covering what refraction is and when it occurs, the direction of bending for air-to-glass and glass-to-air transitions, a full ray diagram showing the incident ray, refracted ray inside the glass block, and the emergent ray exiting parallel to the incident ray, and the relationship between speed, wavelength and frequency at a boundary (frequency does not change; wavelength changes proportionally with speed). For Higher tier, the mechanism of refraction is explained: one side of a wavefront slows down before the other when hitting a boundary at an angle, causing the wavefront to pivot. A table of refraction effects in everyday contexts (pencil in water, pool appearing shallower, prism dispersing white light, archerfish aiming above prey) is included. Two common errors are explicitly flagged: saying frequency changes during refraction, and drawing the emergent ray at a different angle to the incident ray.

Student Exam Practice Sheet (PDF + DOCX) - four exam-style questions: a multiple choice question on the definition of the normal, a four-part refraction question, a prism dispersion question (white light splits into spectrum), and a question on velocity/frequency/wavelength when sound crosses from stainless steel to water.

Teacher Answer Key (PDF + DOCX) - full mark scheme. The ray diagram requires: line bending towards the normal (angle less than incident) AND emergent ray parallel to original incident ray - these are separate marks. The dispersion question requires both “refracted” and “split into spectrum/colours” for full marks; “reflects” is not credited.

Content assessed in Edexcel GCSE Physics Paper 1 (1PH0) and Combined Science.
©BoxsiderResources. Licensed for classroom use by the purchasing teacher. Not for redistribution or resale.