Explain the concept of Interference of Light Waves for double slit problems to a grade 12...

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Physics

Explain the concept of Interference of Light Waves for doubleslit problems to a grade 12 classmate who was absent from class.Use visual aids and examples.

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We can analyze doubleslit interference with the help of Figure1 which depicts an apparatus analogous to Youngs Light from amonochromatic source falls on a slit S0 The light emanating fromS0 is incident on two other slits S1 and S2 that are equidistantfrom S0 A pattern of interference fringes on the screenis then produced by the light emanating from S1 and S2 All slitsare assumed to be so narrow that they can be considered secondarypoint sources for Huygens wavelets The Nature of Light Slits S1and S2 are a distance dapart d1mm and the distancebetween the screen and the slits is D1mFig 1The doubleslit interference experiment usingmonochromatic light and narrow slits Fringes produced byinterfering Huygens wavelets from slits S1 and S2 are observed onthe screenSince S0 is assumed to be a point source of monochromatic lightthe secondary Huygens wavelets leaving S1 and S2 always maintain aconstant phase difference zero in this case because S1 and S2 areequidistant from S0 and have the same frequency The sources S1and S2 are then said to be coherent By coherent waves we mean thewaves are in phase or have a definite phase relationship The termincoherent means the waves have random phase relationships whichwould be the case if S1 and S2 were illuminated by two independentlight sources rather than a single source S0 Two independentlight sources which See Answer

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