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A prism having angle A^(@) (which is ver...

A prism having angle `A^(@)` (which is very small) is placed in front of a point source S at a small distance d. A screen is placed at a large distance D as shown in the figure-6.113. Find the fringe width of interference pattern given that source is emitting light of wavelength `lambda` and refractive index of prism is `mu`.

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Knowledge Check

  • Two coherent point sources S_1 and S_2 are separated by a small distance 'd' as shown. The fringes obtained on the screen will be :

    A
    straigth lines
    B
    semi-circle
    C
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    D
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  • Two coherent point sources S_1 and S_2 are separated by a small distance d as shown. The fringes obtained on the screen will be

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    B
    straight lines
    C
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    D
    concentric circles

  • Two coherent light sources S_1 and S_2 (lambda=6000Å) are 1mm apart from each other. The screen is placed at a distance of 25cm from the sources. The width of the fringes on the screen should be

    A
    (a) `0.015cm`
    B
    (b) `0.025cm`
    C
    (c) `0.010cm`
    D
    (d) `0.030cm`

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