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Light from two coherent sources is reaching a point where path difference for yellow light is `3 lambda//2`. What will be the colour of the fringe at that point ?

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If ligth is monochromatic, a dark fringe will be formed at the point. However, if ligth is white, the fringe seen will be coloured. However, the yellow colour and its neighbouring colours shall be absent.
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Light waves from two coherent source arrive at two points on a screen with path difference 0 and lambda//2 . Find the ratio of intensities at the points.

Knowledge Check

  • Assertion (A) : Light from two coherent sources is reaching the screen. If the path difference at a point on the screen for yellow light is 3 lambda//2 , then the fringe at the point will be coloured. Reason (R ) : Two coherent sources always have constant phase relationship

    A
    Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'
    B
    Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'
    C
    A' is true and 'R' is false
    D
    A' is false and 'R' is true

  • Two coherent source of light can be obtained by

    A
    Two different lamps
    B
    Two different lamps of different power
    C
    Two different lamps of same power
    D
    By dividing a wavefront

  • In Young's double slit experiment, the intensity on the screen at a point where path difference is lambda is K. What will be the intensity at the point where path difference is lambda//4 ?

    A
    (a) `K/4`
    B
    (b) `K/2`
    C
    (c) `K`
    D
    (d) Zero

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    In a Young's double slit set up using monochromatic light of wavelength lambda the intensity of light at a point, where path difference is 2lambda is found to be I_(0) What will be the intensity at a point when path different is lambda//3 ?

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