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At its beginning, the quantum mechanics has been so controversial theory that not all physicist were
able to agree with its assumptions. Nowadays, it seems that the problem does not exist any more, although the quantum theory is still incomplete. The main point of the discussion, which has been raised all
the time, is the problem of the measurement understood as the influence of an observer or a detector
presence on the wave packet describing the state of the observed system. In this paper, the problem of the
influence of the detector on the state of the system is reported on the basis of two-slit experiment described in new formalism called projection evolution. This new approach connects two ways of state
evolution: unitary evolution and evolution visible during the measurement.
