To the right of line PQ is a uniform magnetic field B. B1A is the line of incidence of a charged particle, which comes out of the field along DE; CA and DF are the normals at A and D. B1AC = θ. Angle measured from CA in clockwise direction is taken as positive. if ϕ is the angle between line of emergence DE and normal DF at point D, ratio of ϕ/θ for positive value of θ will be