L35_a - INTERFERENCE OF em WAVES in 2D(ch 27 in text...

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INTERFERENCE OF em WAVES in 2D (ch. 27 in text) Visible light: nm 700 nm 400 To see interference need: o Closely spaced sources with constant phase relation → coherent Independent sources (i.e. lightbulbs) are incoherent → no interference YOUNG ’S DOUBLE -SLIT EXPERIMENT (1801) Observation of interference in light → demonstrated wave character Light through a slit: Diffraction Plane wave incident on slit Slit acts like source of circular waves
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Light through two slits: Interference Get constructive interference along lines where paths from each slit to point on line differ by o along this line, crests from both slits overlap r 1 r 2 Constructive for r 2 - r 1 = n
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