See paper on Young’s double slit experiment Sinθ= λ d where λ is the wavelength in metres and d is the slit width in metres It can be shown that angle of the first minimum (dark region) is given by the following formula. Simple experiment show that the greatest diffraction is given by a narrower slit and/or longer The central fringe is much brighter than the others and twice the width. The fringe pattern is a series of alternate bright and dark fringes with each fringe parallel to the slit. Suggest what type ofĮlectromagnetic radiation would be suitable to use?Ī simple diffraction pattern can be observed if a light source is looked at through a narrow single slit. Sodium and chlorine ions estimated to be 0 nm causes the diffraction. are about the right size and so you can hear sounds aroundĭO: It is possible to get diffraction using a crystal of common salt (sodium chloride). ![]() Get the effect with sound where doors etc. You do not normally see diffraction of light, because the gaps, e. Not shown is that too small a gap and the waves In the graphic below (website School Physics). Too largeĪ gap compared to the wavelength, and the waves pass through without much change: this is shown The effect is only noticed when the gap is of a similar size to the wavelength of the wave. The effect of diffraction is that the wave can effectively travel around a
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