Light from a sodium lamp `(lambda_0=589 nm)` passes through a tank of glycerin
Channel: Doubtnut
Date: 05/07/2020

Light from a sodium lamp `(lambda_0=589 nm)` passes through a tank of glycerin (refractive index `=1.47`) `20m` long in a time `t_1.` If it takes a time `t_2` to transverse the same tank when filled with carbon disulfide (index`=1.63`), determine the difference  `t_2-t_1.`