Q.

A screen is at a distance of 2 m from narrow slits that are illuminated with light of 589 nm. The 10th minimum lies at 0.005 m on either side of the central maximum, then the distance between the slits will be

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a

2.4mm

b

2.23mm

c

24mm

d

0.024mm

answer is B.

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Detailed Solution

D=2m,λ=589nm=589×109m,n=10th min, Y = 0.005m,d = ?
dYD=(2n1)λ2d0.0052=(2×101)589×1092d=2.23mm

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