If .(i)mu(j) represents refractive index...

If `._(i)mu_(j)` represents refractive index when a light ray goes from mefium `i` to medium `j`, then the product `._(2)mu_(1)xx._(3)mu_(2)xx._(4)mu_(3)` is equal to

`""_(3)mu_(1)`

`""_(3)mu_(2)`

`(1)/(""_(1)mu_(4))`

`""_(4)mu_(2)`

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