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Q.

The two slits at a distance of 1 mm are illuminated by the light of wavelength 6.5×10−7m. 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

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a

0.65 mm

b

1.63 mm

c

3.25 mm

d

4.88 mm

answer is B.

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Detailed Solution

Distance between nth Bright fringe and mth dark fringe (n>m)Δx=n−m+12β=5−3+12×6.5×10−7×11×10−3 =1.63mm
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