Key term for Edexcel GCSE Physics, used in The EM Spectrum.
A property of a medium that describes how much it slows down the propagation of electromagnetic waves.
Optical density appears in Edexcel GCSE Physics revision content for Light and the electromagnetic spectrum, especially The EM Spectrum and Velocity Differences.
Light and the electromagnetic spectrum
Velocity Differences
Light and the electromagnetic spectrum
Core Practical: Refraction
Light and the electromagnetic spectrum
Ray Diagrams and TIR
Waves
Wave Interaction with Substances
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Light and the electromagnetic spectrum
Light, Lenses and Reflection • Ray Diagrams and TIR
