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Homework Help: RE:bright fringes

  1. Dec 13, 2008 #1
    1. The problem statement, all variables and given/known data
    Original Post:

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Dec 13, 2008 #2
    Re: bright fringes..

    The link to your earlier post isn't working. Did you list relevant equations and show an attempt at a solution when you originally posted this problem?
  4. Dec 13, 2008 #3
    Re: bright fringes..

    hmm,actually i just wanted to know how to figure out the m when i encounter this kind of questions...

    eg of a relevant que is:Two slits separated by 0.250 mm produces an interference pattern in which the fifth dark band is located 12.8 cm from the central antinode when the screen is placed a distance of 8.2 meters away.

    solution: because central antinode is m=o wright?then counted frm central antinode to 5th dark fringe..so it works out to be 4.5!so frm antinode m=0,go through m=1,2,3,4 when it reaches 4th fringes of bright fringe its m=4.thus que requires 5th dark fringe so the other half contributes which is 4th bright fringes + 1/2 bright fringe ans wll be 4.5,am i wright?if its not the way,could you please show me the exact way to determine m????thank a lot
  5. Dec 13, 2008 #4
    Re: bright fringes..

    > am i wright.

    You certainly are, Wilbur! The dark patches will be halfway between the light patches - so if you imagine/sketch the fringes then count along, you'll get m=4.5 for the 5th dark patch.
  6. Dec 13, 2008 #5
    Re: bright fringes..

    oh,ok,i finally understand..thanks for your kind help,is much appreciated..btw,what's wilbur?haha,thanks a lot yea..what's your name?glad to have you to teach me..thanks..
  7. Dec 14, 2008 #6
    Re: bright fringes..

    Wilbur and Orville Wright - the Wright brothers.
  8. Dec 14, 2008 #7


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    Re: bright fringes..

    :rofl: :rofl: :rofl: LOL
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