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Oil floating on water looks cloured due ...

Oil floating on water looks cloured due to interference of light. What should be the approximate thickness of the film for such effects to be visible ?

Text Solution

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For intereference effect to be visible light, which varies from `4000 Å` to `8000 Å`.
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Knowledge Check

  • An oil flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be

    A
    `100 Å`
    B
    `10000 Å`
    C
    1 mm
    D
    1 cm

  • For observing interference in thin films with a light of wave length lamda the thickness of the film:

    A
    may be of any magnitude
    B
    should be much smaller than `lamda`
    C
    should be of the order of `lamda`
    D
    should be a few thousand times of `lamda`

  • Interference of light is the physcal effect which is produces due to the

    A
    superpositon of light waves
    B
    reflection of waves
    C
    refractino of light waves
    D
    Huugen's principle

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