Following table gives the numerical value of absolute refractive indices of several transparent media. {:("Transparent medium","Refractive Index","Transparent medium","Refractive index"),("Free space",1.000,"Canada balsam",1.53),("Air",1.0003,"Rock salt",1.54),("Ice",1.31,"Carbon disulphide",1.63),("Water",1.33,"Dense flint glass",1.65),("Alcohol",1.36,"Ruby",1.71),("Kerosene",1.44,"Sapphire",1.77),("Turpentine oil",1.47,"Diamond",2.42),("Crown glass",1.52,,):} If speed of light in free space is 3 xx 10^(8) ms^(-1), then in a rock salt crystal light travels with a speed :

Following table gives the numerical value of absolute refractive indic

1.	Following table gives the numerical value of absolute refractive indices of several transparent media. {:("Transparent medium","Refractive Index","Transparent medium","Refractive index"),("Free space",1.000,"Canada balsam",1.53),("Air",1.0003,"Rock salt",1.54),("Ice",1.31,"Carbon disulphide",1.63),("Water",1.33,"Dense flint glass",1.65),("Alcohol",1.36,"Ruby",1.71),("Kerosene",1.44,"Sapphire",1.77),("Turpentine oil",1.47,"Diamond",2.42),("Crown glass",1.52,,):} If speed of light in free space is 3 xx 10^(8) ms^(-1), then in a rock salt crystal light travels with a speed :
Answer» `1.95 xx 10^(8) MS^(-1)` `4.62 xx 10^(8) ms^(-1)` `1.54 xx 10^(8) ms^(-1)` `3 xx 10^(8) ms^(-1)` SOLUTION :SPEED of light in rock salt `v = (c)/(n_("rocksalt")) = (3 xx 10^(8))/(1.54) = 1.95 xx 10^(8) ms^(-1)`