Two slits at a distance of 1mm are illum...

Two slits at a distance of `1mm` are illuminated by a light of wavelength `6.5xx10^-7m`. The interference fringes are observed on a screen placed at a distance of `1m`. The distance between third dark fringe and fifth bright fringe will be

0.65mm

1.62mm

3.25mm

0.975mm

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The correct Answer is:

Distance between third dark fringe and the fifth bright fringe
`2.5beta=2.5 (lambdaD)/d =2.5 (6.5xx10^(-7)xx1)/10^(-3) =1.625MM`

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