1.

If nij is reftactive index of medium i with respect to medium j n_21 X n_32 X n_43 = ..........

Answer»

`3^(MU)""_1`
`3^(mu)""_2`
`(1)/(1^(mu)""_4)`
`4^(mu)""_2`

Solution :`""_2mu_1xx""_3mu_2xx""_4mu_3=(mu_1)/(mu_2)XX(mu_2)/(mu_3)xx(mu_3)/(mu_4)`
`=(mu_1)/(mu_4)=""_4mu_1=(1)/(""_1mu_4)`


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