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Light from a sodium lamp (lambda0=589 nm...

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.`

A

`6.67xx10^(-8)sec`

B

`1.07xx10^(-7)sec`

C

`2.07xx10^(-7)sec`

D

`1.07xx10^(-8)sec`

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