refraction - bending of light , reflection - light bouncing off surfaces, dispersion - splitting of light into different colours, frequency - The number of waves that pass a point in one second., wavelength - length of a wave, hertz - The unit used to measure frequency., decibels - The scale used to measure loudness., convex lens - A lens that can be used as a magnifying lens when placed close to an object, concave lens - a lens that spreads light apart, the sun - A source of electromagnetic radiation,

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