Refractive indices of water and glass are 4/3 and 3/2 respectively. Find the refractive index of glass with respect to water.

Fill in the blank spaces with appropriate answers: The refractive indices of water and glass are (4/3) and (3/2) respectively. If the speed of light in water is 2.25 xx 10^8 m//s) then the speed of light in glass is _______ m/sec.

Refractive indices for glass and water are (5//3) and (4//3) respectively. The critical angle at the glass-water interface is