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In Young's double slit experiment the wi...

In Young's double slit experiment the width of the fringe is 2.0 mm. Find the distance between 9th bright band and 2nd dark band.

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It is seen from the Fig 6.19 the distance of the 9th bright band from second dark band
=`7.5 xx ` width of fringe = `7.5 xx 0.2 ` cm =1.5 cm
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