In Young’s double slit experiment, blue-green light of wavelength 500 nm is used. The slits are 1.20 mm apart, and the viewing screen is 5.40 m away from the slits. What is the fringe width.

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6.2 mm

4.2 mm

2.25 mm

1.25 mm

answer is C.

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Detailed Solution

The given values areλ=500 nm=500×10−9 md=1.20 nm=1.20×10−3 mD=5.40 mFringe width β=λDd=500×10−9×5.401.20×10−3=27001.20=2250 x10-6 m∴β=2.25 mm

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