eXl
tan θ = ----- .
mu2
The photographic plate was at a distance h above the extremity of the field. Thus the particles struck the plate at a distance d2 from the original path given by
In the experimental arrangement the values were
d2 = ·4 cms.;
X = 1·02 × 1012;
l = 3·45 cms.;
h = 1·2 cms.