In Young's double slit experiment, the angular position of a point on the central maxima whose intensity is one fourth of maximum intensity
1
\(\sin^{-1}(\lambda/\mathrm{d})\)
2
\(\sin^{-1}(\lambda/2d)\)
3
\(\sin^{-1}(\lambda/3d)\)
4
\(\sin^{-1}(\lambda/4d)\)