• Waves [FREE] - Longitudinal and transverse waves explained

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• Wave Speed [FREE] - How to measure how fast these waves are travelling

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• Reflection, Transmission and Absorption [FREE] - Bouncing waves 

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• Refraction - Waves that change direction when they meet a boundary​ 

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• TIR and Refraction Equations - Calculating what happens to the light

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• Lenses - These refract light and can form an image of an object

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• Ray Diagrams - Converging lenses and drawing the images they make

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• Images - Real and virtual images and how we can calculate their magnification

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• The Electromagnetic Spectrum - A range of transverse waves with many uses​

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• Sound [FREE] - Particle vibrations between 20 and 20,000 Hz, and how our ears pick these up 

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