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Math Help - Impact of white light source on fringe pattern

  1. #1
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    Impact of white light source on fringe pattern

    Hi
    A little help will be appreciated

    (a)Double slit interference fringes are observed using light of wavelength 590nm abd a pair of double slits of spcing o.50mm. The fringes are observed on a screen at a distance of 0.90m from the double slits. Calculate the fringe seperation of these fringes.

    (b)Describe and explain the fringe pattern that would be observed if the light source were replaced by a white light source

    SOLUTION
    I was able to do (a)

    With (b) I surmised that fringe patterns would increase. White light contains a wide range of wavelengths. So, according to
    W= (Wavelength x D)/s

    The fringe pattern is proportional to the wavelength.

    Please comment.
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  2. #2
    MHF Contributor Unknown008's Avatar
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    Right, white light contains a variety of wavelengths, and each wavelength will be diffracted by a different amount, so that you have different patterns. And since the wavelength is what determines the colour of the light, you'll have patterns of all sorts of colour!
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  3. #3
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    You are a star! Apologies for all the questions. I am full time worker battling Maths, Physics AND Further Maths A levels!

    Cheers!!
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  4. #4
    MHF Contributor Unknown008's Avatar
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    Oh, you're in your first year of A level Physics is seems. I just finished my second year. I have Chemistry exam this Friday (the last exam).

    I'm glad to help
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  5. #5
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    I wish I could call it 1st year. I work full time and studying A Levels on my own. Thats why I have so many silly questions. I am presently at work. I will be doing PHY1,2 and 4 in January. Thats not to mention M2,M3,FP1,C3 and C4.

    How come you have an exam on Friday? And where are you applying or have applied to? Sorry for being nosy, but I admire your depth of knowledge!
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  6. #6
    MHF Contributor Unknown008's Avatar
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    Um... maybe we're not in the same syllabus then... I have no idea of what is M2, M3, FP1, C3 or C4. The exam I'm taking part in is the IGSCE A level by Cambridge.
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  7. #7
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    Yeah. So, I presume your qualification is equivalent to A levels? Does it involve a lot of practicals.
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