  We have measured the correlation between the lensing signal induced by (dark)
matter and number counts of galaxies on scales ranging from 0.15-3.0
h_{50}^{-1} Mpc (which correspond to aperture radii of 1-15 arcminutes). This
provides a direct probe of the scale dependence of the ratio of the classical
bias parameter b and the galaxy-mass correlation coefficient r. The results
presented here are based on 16 deg^2 of R_C band data taken with the CFHT as
part of the Red-Sequence Cluster Survey. We used a sample of lens galaxies with
19.5<R_C<21, and a sample of source galaxies with 21.5<R_C<24. The results are
consistent with a scale independent value of b/r, which provides valuable
constraints on models of galaxy formation on scales that can only be probed
through weak lensing. For the currently favored cosmology (\Omega_m=0.3,
\Omega_\Lambda=0.7) we find b/r=1.05^{+0.12}_{-0.10}, similar to what is found
on larger scales (~10 h_{50}^{-1} Mpc) from local dynamical estimates. These
results support the hypothesis that light traces mass on scales ranging from
0.15 out to ~10 h_{50}^{-1} Mpc. The accuracy of the measurement will improve
significantly in the coming years, enabling us to measure both b and r
separately as a function of scale.
