the intensity at the central maxima (o) in a young's double slit experiment is Io. If the distance OP equals 1/3rd of the fringe width of the pattern , show that the intensity at a point would be I0/4.
in the experiment on diffraction due to single slit show that

I) The intensity of diffraction fringes decreases as the order n increases
ii) angular width of the central maximum is twice that of the firdt order secondary maximum

Phase difference is zero at point O. 

Intensity at point O is, 

Path difference at point P is,

x = λ/3

Phase diffidence,

For the last part please refer to the study material. 

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