Answer:
They can be seen from a distance of 4.372 kilometers.
Explanation:
Using the Reyligh creterion for diffraction through a circular aperture we have
[tex]\frac{x}{D}=\frac{1.22\lambda }{d}[/tex]
where symbol's have their usual meaning
thus applying values we get
[tex]D=\frac{dx}{1.22\lambda }[/tex]
[tex]\therefore D=\frac{0.633\times 4.61\times 10^{-3}}{1.22\times 547\times 10^{-9}}\\\\D=4372.77m\\=4.372km[/tex]
