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Question

The shift of the interference pattern on the screen when the slit is displayed by Sl=1mm along the arc of radius r with centre at 0.
155145_ba98e5f801ef40ff91bbdb74a962abe1.png

A
4mm
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B
6mm
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C
10mm
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D
13mm
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Solution

The correct option is D 13mm
The mirror will rotate by lr or rotation of reflected ray =lr shift in fringe magnitude
=blr =1.3×(10)2=13mm

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