The following thin-layer chromatogram was obtained from a mixture of naphthalene, \( C_{10}H_8 \), and naphthol, \( C_{10}H_7OH \). A polar silica was used as the stationary phase, and a non-polar hexane as the mobile phase. Spot ‘x’ migrated 5.6 cm from the baseline. Spot ‘y’ migrated 3.5 cm from the baseline. The solvent front reached 7.0 cm. What are the position and retardation factor (\( R_f \)) of naphthalene?