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Assertion: The pattern and position of f...

Assertion: The pattern and position of fringes always remain same even after the introduction of transparent medium in a path of one of the slit.
Reason: The central fringe is bright or dark is depend upon the initial phase difference between the two coherence sources.

A

(a) If both assertion and reason are true and reason is the correct explanation of assertion.

B

(b) If both assertion and reason are true but reason is not the correct explanation of assertion.

C

(c) If assertion is true but reason is false.

D

(d) If assertion and reason both are false.

Text Solution

Verified by Experts

The correct Answer is:
C
If a transparent medium of thickness t and refractive index `mu` is introduced in the path of one of the slits, then effective path in air is increased by an amount `(mu-1)` due to introduction of plate.
Therefore, the zeroth fringe shifts to a new position where the two optical paths are equal. In such case fringe width remains unchanged.
The central fringe is bright or dark depends upon the initial phase difference between the two coherent sources.
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Knowledge Check

  • Assertion: The pattern and position of fringes always remain same even after the introduction of transparent medium in a path of one of this slits. Reason: The central fringe is bright or dark does not depend uupon the initial phase difference between the two coherence sources.

    A
    If both assertion and reason are true and reason correct explanation of assertion.
    B
    If both assertion and reason are true but reason the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
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    C
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    D
    `(2n-1)pi`

  • Two coherent sources of light interfere and produce fringe pattern on a screen . For central maximum phase difference between two waves will be

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    B
    `pi`
    C
    `3pi/2`
    D
    `pi/2`

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