plz answer this question :- In a double slit diffraction arrangement , what should be the width of each slit to obtain 10 maxima of double slit pattern within the central maximum of the single slit pattern ? [ two slits are made 1mm apart ]

the slit width-wavelength relation is given as


aθ = λ


a is the slit width

θ is the angular separation  and

λ is the wavelength



θ = λ/a


now, in this case we have

width of  each slit = width of ten maxima


10(λ/d) = 2(λ/a)


a = d/5

thus, the slit width will be

a = 1/5 = 0.2 mm

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