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The distance between the slits is 0.7 mm
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Answer #1

\lambda = wavelength = 5.5 x 10-7 m

D = screen distance = 3.3 m

w = distance between bright fringes

d = slit width

distance between bright fringes is given as

w = D\lambda/d

d = D\lambda/w

d = (3.3) (5.5 x 10-7 )/w = (18.2 x 10-7 )/w

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