  Two-slit interference experiment with a which-way detector has been a topic
of intense debate. Scientific community is divided on the question whether the
particle receives a momentum kick because of the process of which-way
measurement. It is shown here that the same experiment can be viewed in two
different ways, depending on which basis of the which-way detector states one
chooses to look at. In one view, the loss of interference arises due to the
entanglement of the two paths of the particle with two orthogonal states of the
which-way detector. In another view, the loss of interference can be
interpreted as arising from random momentum kicks of magnitude $h/2d$ received
by the particle, $d$ being the slit separation. The same scenario is shown to
hold for a three-slit interference experiment. The random momentum kicks for
the three-slit case are of two kinds, of magnitude $\pm h/3d$. The analysis is
also generalized to the case of n-slit interference. The two alternate views
are described by the same quantum state, and hence are completely equivalent.
The concept of "local" versus "nonlocal" kicks, much discussed in the
literature, is not needed here.
