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}})