Where crests meet or troughs meet there is reinforcement ( constructive interference) – where a crest and tough meet there is cancellation ( destructive interference ). The diffracted waves then interfere with each other. Wavelengths are diffracted at different angles, according to the gratingĬonsider a magnified view of part of a diffraction grating:Įach slit diffracts the light waves that pass through it. It is excellent at separating the colors in incident light because different The diffracted light waves from adjacent slits reinforce each other in certain directions only, including the incident light direction, and cancel out in all other directions. The light passing through each slit is diffracted, When a parallel beam of monochromatic light is directed normally (at right angles to it!) at a diffraction grating, light is transmitted by the grating in certain directions only. Slides etched by a needle point - now they tend to be printed onto a slide. Grating is a slide with large number of parallel, closely spaced slits A Level and AS level - UK KS 5 (Age 16 - 18).
GCSE and 'O' Level - UK KS4 (Age 14 - 16).
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