Answer:C
Explanation:
Given
Wavelength of light [tex]\lambda =632\ nm[/tex]
Screen is placed at a distance of [tex]D=3.5\ m[/tex]
width of central maximum [tex]w=15\ mm[/tex]
We know that width of central maximum is given by
[tex]w=\frac{2.44\lambda D}{d}[/tex]
where d=diameter of hole
[tex]d=\frac{2.44\lambda D}{w}[/tex]
[tex]d=\frac{2.44\times 632\times 10^{-9}\times 3.5}{15\times 10^{-3}}[/tex]
[tex]d=0.359\ mm[/tex]
[tex]d=0.36\ mm[/tex]
