With two slits spaced 0.2mm apart and a screen at a distance of 1m. The third fringe is found to be at 7.5 mm from the central fringe. The wavelength of light used is
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a
400 nm
b
500 nm
c
550 nm
d
600 nm
answer is B.
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Detailed Solution
position of the third fringe from the central maxima is 3β =3λDd=7.5 mmλ =7.5×10-3×0.2×10-43×1= 5×10-7
With two slits spaced 0.2mm apart and a screen at a distance of 1m. The third fringe is found to be at 7.5 mm from the central fringe. The wavelength of light used is