  We report on extensive V, R, and i band photometry of the black-hole
candidate Nova Sco 1994 (GRO J1655-40) obtained during March 1996, when the
source was close to its quiescent pre-outburst optical brightness (V=17.3).
  From our observations and data taken from the literature we derive a refined
ephemeris for inferior conjunction of the secondary star: HJD 2449838.4198(52)
+ 2.62168(14) x N. We have modeled the V, R, and i band light curves in terms
of a Roche lobe filling secondary and an accretion disk around the compact
star, the latter described as a flat cylinder with a radial temperature
distribution. From the shape of the light curve we constrain the binary
inclination and mass of the secondary star to lie in the ranges 63.7-70.7
degrees and 1.60-3.10 Solar masses, respectively. This limits the mass of the
black-hole to the range 6.29-7.60 Solar Masses. The mass range we obtained for
the secondary star is supported by the results of stellar evolution
calculations.
