Focal Length - The distance between the centre of a lens and its principal focus., Power of a Lens - Equal to the reciprocal of the focal length of a lens., Real Image - An image produced by light-rays physically converging., Seismic Waves - Waves that are produced by earthquakes., Time Period - The time it takes for one complete wave to pass a given point., Virtual Image - An image produced by the apparent, but not actual, divergence of light-rays., Wavefront - Imaginary surface representing points of a wave that are at the same point in their cycle, X-Rays - Used for medical imaging and security scanners. (Can cause cell damage) , Principal Focus - The point before or after a lens where light rays appear to meet., Specular Reflection - The reflection of a wave from a smooth surface.,

GCSE, Combined Science, Physics, JMc, OCR, Gateway, KS4, Foundation

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