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Coherent light is incident on two fine p...

Coherent light is incident on two fine parallel slits `S_(1)` and `S_(2)` as show in fig. If a dark fringe occurs at P, which of the following gives possible phase difference for the light waves arriving at P from `S_(1)` and `S_(2)` ?

A

`2pi, 4pi, 6pi….`

B

`1//2pi, 5//2pi, 6//2pi…..`

C

`pi, 3pi, 5pi…..`

D

`1//2pi, 3//2pi, 5//2pi……`

Text Solution

Verified by Experts

The correct Answer is:
C
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Knowledge Check

  • A coherent light is incident on two paralle slits S_(1) and S_(2) . At a point P_(1) the frings will be dark if the phase difference between the rays coming from S_(1) and S_(2) is

    A
    `n pi ` radians
    B
    `(n+0.5) pi` radians
    C
    `(2n+0.5) pi` radians
    D
    (`2n+1) pi` radians

  • In the set up shown in figure, the two slits S_1 and S_2 are not equidistant from the slit S. The central fringe at O is then

    A
    (a) Always bright
    B
    (b) Always dark
    C
    (c) Either dark or bright depending on the position of S
    D
    (d) Neither dark nor bright

  • Light is falling on the surfaces S_(1),S_(2) and S_(3) as shown below. The surfaces on which the angle of incidence is equal to the angle of reflection are

    A
    `S_(1) and S_(3)`
    B
    All the three surfaces
    C
    `S_(1) and S_(2)`
    D
    `S_(2) and S_(3)`

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