The separation of two adjacent maxima is given by formula
where L is the distance from the centres of the slits to the screen, λ is the wavelength of the light, d is the the distance between the centres of the slits
In our case, d=1,000 λ
Using (1) we get
Δ=L
Answer
the separation of two adjacent maxima is equal to the distance from the centres of the slits to the screen
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