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Q.

In YDSE,  a source of wavelength 6000 A0  is used. The screen is placed 1 m from the slits. Fringes formed on the screen, are observed by a student sitting close to the slits. The student's eye can distinguish two neighboring fringes. If they subtend an angle more than 1 minute of arc. What will be the maximum distance between the slits so that the fringes are clearly visible

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a

2.06 cm

b

2.06 mm

c

2.06×103 mm

d

None of these

answer is A.

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Detailed Solution

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According to given problem angular fringe width θ=λdπ180×60 [As 1=π180×60rad ] d<6×107×180×60π d<2.06×103mdmax=2.06mm 

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