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PowerPoint Slides to Chapter 01

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    PROPRIETARY MATERIAL 2010 The McGraw-Hill Companies, Inc. All rights reserved. No part of this PowerPoint slide may be displayed, reproduced or distributed in any

    form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their

    individual course preparation. If you are a student using this PowerPoint slide, you are using it without permission.

    http://www.mhhe.com/hayt6ehttp://www.mhhe.com/hayt6e
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    PROPRIETARY MATERIAL 2010 The McGraw-Hill Companies, Inc. All rights reserved. No part of this PowerPoint slide may be displayed, reproduced or distributed in any

    form or by any means, without the prior written permission of the publisher, or used beyond the limited distribution to teachers and educators permitted by McGraw-Hill for their

    individual course preparation. If you are a student using this PowerPoint slide, you are using it without permission.

    Copyright 2010 Tata McGraw-Hill Education, All Rights Reserved.

    Hitendera K Malik

    A K Singh

    ENGINEERING PHYSICS

    http://www.mhhe.com/hayt6ehttp://www.mhhe.com/hayt6ehttp://www.mhhe.com/hayt6e
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    Chapter-1

    INTERFERENCE

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    You would have seen beautiful colours in soap films or patch of oil

    floating on the surface of water. Moreover, the colour gets

    changed when you watch it from different angles. Did you ever try

    to find out the reason? In scientific language, this takes place due

    to the phenomenon of interference. The phenomenon of

    interference of light tells us about the wave nature of the light. In

    optics, the interference means the superposition of two or more

    waves which results in a new wave pattern. Here, we are talking

    about the interaction of waves emerging from the same source or

    when the frequencies of these waves are the same. In the context

    of light, which is an electromagnetic wave, we say that when thelight from two different sources moves in the same direction, then

    these light wave trains superimpose upon each other. This results

    in the modification of distribution of intensity of light. According

    to the principle of superposition, this is called the interference of

    light.

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    More precisely the interference can be defined as the interaction

    between two or more waves of the same or very close frequencies

    emitted from coherent sources (defined later), where the

    wavefronts are combined according to the principle of

    superposition. The resulting variation in the disturbances produced

    by the waves is called the interference pattern. Thomas Young, in

    1802, explained the interference successfully in his double slit

    experiment.

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    Fig. 1.1

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    Fig. 1.5

    A

    B

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    SUMMARY

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    SUMMARY

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    SUMMARY

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    EducationWhere the world learns to succeed