If \(\eta_{1}\) and \(\eta_{2}\) are coefficients of viscosity of two liquids, \(d_{1}\) and \(d_{2}\) are their densities and \(t_{1}\) and \(t_{2}\) are their flow times in an Ostwald's viscometer then (a) \(\frac{\eta_{1}}{\eta_{2}}=\frac{d_{1} t_{2}}{d_{2} t_{1}}\) (b) \(\frac{\eta_{1}}{\eta_{2}}=\frac{d_{2} t_{2}}{d_{1} t_{1}}\) (c) \(\frac{\eta_{1}}{\eta_{2}}=\frac{d_{1} t_{1}}{d_{2} t_{2}}\) (d) \(\frac{\eta_{1}}{\eta_{2}}-\frac{d_{2} t_{1}}{d_{1} t_{2}}\)

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