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Q.

Two slits are separated by a distance of 0.5 mm and illuminated with light of λ=6000Å. If the screen is placed 2.5 m from the slits. The distance of the third bright image from the centre will be

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a

1.5 mm

b

3 mm

c

6 mm

d

9 mm

answer is D.

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Detailed Solution

Distance of the nth bright fringe from the centre xn=nλDd ⇒x3=3×6000×10−10×2.50.5×10−3=9×10−3m=9mm

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