  We propose a new method that can be used to constrain the properties of the
Galactic bar (bulge). If the majority of the lensing objects are in the
Galactic bar, then we predict a systematic offset in the apparent magnitude
between lensed stars and all observed stars. Using OGLE color-magnitude diagram
data we model this effect in the region of the diagram dominated by bulge red
clump stars and find that for some models of the Galactic bar the expected
offset in the apparent magnitude may be as large as $0.2 mag$. About 100 lensed
stars in the red clump region of the color-magnitude diagram is needed to
unambiguously detect this effect, a number within the reach of current
microlensing projects. We find a good correlation between the extent of the bar
along the line of sight and the expected magnitude offset. We also obtain a
constraint for the extent of the bar along the line of sight using the observed
luminosity function for the red clump stars.
