At two points p and q on screen in young's double slit experiment, waves from slits s1 and s2 have a path difference of 0 and ? 4 respectively. The ratio of intensities at p and q will be
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path difference 0,lambda/4
so phase difference 0, pi/2
in case of zero, intensity= (2*sqrt(I))^2=4I
in cese of pi/2 I+I+2*sqrt(I*I)cos(pi/2)=2I
so I at P/I at Q=2
so phase difference 0, pi/2
in case of zero, intensity= (2*sqrt(I))^2=4I
in cese of pi/2 I+I+2*sqrt(I*I)cos(pi/2)=2I
so I at P/I at Q=2
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