[sciconoclast (OP)]

Greetings inquisitive minds.

I have made some additional observations with a modified Fresnel experiment which may or may not challenge the Bohr concept of detection induced  quantum field collapse.

In this modified experiment laser light is split by a beam splitter and then brought back by front centered silver mirrors to two center mirrors which act as Fresnel mirrors to direct the paths into an interference field.  Next  vertical single slits are placed in each of the paths before reaching the center mirrors or optionally one single slit is placed before them beam splitter.

The light leaving the Fresnel mirrors is brought into convergence at the target screen. If the light exits the mirrors in the same horizontal plain there is a double slit pattern with the nodal line spacing commensurate with the separation between the paths leaving the mirrors.   If the mirrors are adjusted so that one path exits the Fresnel mirrors low on an upward path and the other exits high on a downward path, then there are only single slit anti-nodal bands even when the paths are brought into convergence.   

If the light exits the mirrors in the same horizontal plain but exits at a divergent horizontal angle ( for example 1.58977482 degrees for an exit separation of 6.00mm ) there will be two separate center maxima with numerous overlapping single slit anti-nodal bands between them but an absence of any double slit nodal spacing.  If the light exits at a convergence angle ( 1.65229206 degrees ) a portion of the anti-nodal bands will be divided by double slit nodal line ( the center eleven of the twenty five bands between the maxima when using 0.75mm slits )  This is true even if  the screen is positioned to where the two different angles intersect the target screen with the same maxima separation ( 0.350m at a distance of 12.370m ). 

This seems to indicate that the interference pattern is formed early and only when the light paths are in close proximity and not separated in either the vertical or horizontal plains.  This seems to confirm the results of two different experiments that I posted earlier that utilized light passing through an actual double slit rather than being reflected of of a Fresnel mirror.  It may be that for the Bohr interpretation of quantum theory to meet this condition the theoretical point of quantum field collapse may need to be modified.