A planar structure of length L and width...

A planar structure of length L and width W is made of two different optical media of refractive indices `n_(1) = 1.5` and `n_(2)` = 1.44 as shown in figure. If `L gt gt W`, a ray entering from end AB will emerge from end CD only if the total internal reflection condition is met inside the structure. For L = 9.6 m, if the incident angle `theta` is varied, the maximum time taken by a ray to exit the plane CD is `t xx 10^(-9)` s, where t is______.
[Speed of light `c = 3 xx 10^(8) m//s`]

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