circular aperture is given by:
sin@ = n*l/ d ----------------------1
n = 1.22 for minima, l= wavelength= 632.8nm, d= aperture diameter= 0.200 cm
D= distance of screen from source of light = 14 km
also sin@ = y/ D ----------------------2
from eq. 1 and 2
y/D = n*l/ d
y = D*n*l/d
y = 14*103*1.22*632.8*10-9 / 0.200*10-2
y= 5.404 m
total width ( diameter of beam on screen) , 2y = 10.80 m
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