In an experiment on interference due to single mirror a light wave ...

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In an experiment on interference due to single mirror a light wave emitted directly by the source \( S \) (narrow slit) interferes with the wave reflected from the mirror M of length \( 2 \mathrm{~mm} \). Source and screen are separated by distance \( 90 \mathrm{~cm} \). Source \( S \) is at the height of \( 3 \mathrm{~mm} \), from the point \( P \) and the middle point of mirror is at distance of \( 2 \mathrm{~mm} \) from point \( \mathrm{P} \). Point \( \mathrm{P} \) and mirror are in the same plane and plane of screen is perpendicular to this plane.
If the mirror is shifted towards left then how does the fringe pattern on screen change?
(A) fringe width decreases and the region in which interference is formed shifts downward.
(B) fringe width decreases and region in which interference is formed shifts upwards.
(C) fringe width does not change and region in which interference is formed shifts upwards.
(D) fringe width does not change and region in which interference is formed shifts downward.
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