ratio vs index of refraction

Other hyponyms of ratio include gross margin, margin of profit, profit margin, abundance, abundance, albedo, reflective power, aspect ratio, average, breadth index, cephalic index, cranial index, efficiency, facial index, f number, focal ratio, speed, stop number, frequency, relative frequency, haematocrit, hematocrit, packed cell volume, I.Q., intelligence quotient, IQ, load factor, loss ratio, Mach number, magnification, mechanical advantage, fuel consumption rate, gas mileage, gasoline mileage, mileage, betting odds, odds, magnitude, order of magnitude, output-to-input ratio, prevalence, P/E ratio, price-to-earnings ratio, productivity, proportionality, quotient, refractive index, relative humidity, respiratory quotient, factor of safety, safety factor, S/N, signal/noise, signal/noise ratio, signal-to-noise, signal-to-noise ratio, stoichiometry, time constant, employee turnover, turnover, turnover rate, loading, eccentricity, cash reserve ratio, required reserve ratio, reserve ratio, accounting ratio, financial ratio, adiabatic index, heat capacity ratio, compression ratio.