A ray of light travels from air to water. The refeactive index of water is given by the expression

A. \(\frac{\text{velocity in water}}{\text{velocity in air}}\)
B. \(\frac{\text{sine of angle of refraction}}{\text{sine of angle of incidence}}\)
C. \(\frac{\text{apparent depth}}{\text{real depth }}\)
D. \(\frac{\text{wavelength in air}}{\text{wavelength in water}}\)  

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Correct Answer: D