In a Young's double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is $\frac { 1 } { 8 }$th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to:\\
(1) 0.74\\
(2) 0.85\\
(3) 0.94\\
(4) 0.8