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AH physics exam tomorrow - help with waves question? thanks

  1. May 4, 2015 #1

    1. The problem statement, all variables and given/known data

    If the optical path diff between two light waves is lambda/2 will they always interfere destructively? if this in true then wherever one wave undergoes aphase change of pi at one surface and the second wave does not then these two will always interfere destructively?

    that's what the 2007 past paper question 10 suggests but i didnt think this was true



    SQA answers: ad%26pid%3D3%26fid%3DSent%26inline%3D1%26appid%3Dyahoomail&hash=dbf351e27334342ee385cb2d687ed0ba.png https://us-mg6.mail.yahoo.com/ya/download?mid=2%5f0%5f0%5f2%5f4065%5fAGtL2kIAAA9%2bVUfn%2fgyiYFWt%2bYk&m=YaDownload&pid=3&fid=Sent&inline=1&appid=yahoomail [Broken]

    2. Relevant equations

    In the attached question and SQA marking scheme

    3. The attempt at a solution

    If the optical path diff between two light waves is lambda/2 will they always interfere destructively? if this in true then wherever one wave undergoes aphase change of pi at one surface and the second wave does not then these two will always interfere destructively?



    thanks so much for any help - exam tomorrow :(
     
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. May 5, 2015 #2

    andrevdh

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    Homework Helper

    What other parameter(s) of the waves would make this statement untrue?
     
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