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LIGHT- REVISION NOTES When waves meet a boundary, where the medium (stuff) changes, they may: * reflect - bounce back e.g. light at a mirror, sound echoing off a wall * refract - go through the boundary, usually changing speed and direction as they do e.g. light through spectacles, water waves going from deep to shallow water * get absorbed - give up their energy, warming up the surface layer e.g. in a solar heater Quite often, there's some of each happening. High tier only * When waves meet a gap, they carry on, but diffract - they spread out into the shadow behind the gap. * The extent of diffraction (spreading) depends on the width of the gap. 1. a gap similar to the wavelength: a lot of spreading, no sharp shadow e.g. sound through a doorway 2. a gap much larger than the wavelength: little spread, sharp shadow e.g. light through a...

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