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.

Assertion: The pattern and position of fringes always remain same even

1.	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.
Answer» If both assertion and reason are true and reason correct explanation of assertion. If both assertion and reason are true but reason the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Solution :If a transprant medium of thickness `t` and refractive index `m` is introduced in the path of one of the slits, then effective path in air is increased by an amount `(mu - 1)t` due to induction of plate. Therefore, the zeroth fringe shifts to a NEW position where the two optical PATHS are equal. in such CASE fringe WIDTH unchraged. The centreal fringe is bright or dark depends upon the initial phase difference between the two conherent sources.

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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.

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