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.

\(\frac{\text{wavelength in air}}{\text{wavelength in water}}\)

Correct answer is D

No explanation has been provided for this answer.