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the slit width-wavelength relation is given as
aθ = λ
where
a is the slit width
θ is the angular separation and
λ is the wavelength
so,
θ = λ/a
now, in this case we have
width of each slit = width of ten maxima
so,
10(λ/d) = 2(λ/a)
or
a = d/5
thus, the slit width will be
a = 1/5 = 0.2 mm
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