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Q.

Two slits, 4 mm apart, are illuminated by light of wavelength 6000 Å. What will be the fringe width on a screen placed 2m from the slits

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a

0.12 mm

b

0.3 mm

c

3.0 mm

d

4.0 mm

answer is B.

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Detailed Solution

β=λDd=6000×10−10×24×10−3=3×104m=0.3mm
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