Multiple choice The refractive index of glass with respect to water is 9/8. It implies that the speed of light respectively is 9 times and 8 times slower in glass and water with respect to vacuum the speed of light in glass is 9/8 times faster than that in water <font size="2" face="Arial">the speed of light in water is 9/8 times faster than that in glass</font> None of these Reveal answer Fill a bubble to check yourself C Correct answer Explanation The speed of light in water is 9/8 times faster than that in glass.