A planar structure of length L and width W is made of two different optical media of refractive indices n1=1.5 and n2=1.44 as shown in figure. If L>>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=9.6m, if the incident angle θ is varied, the maximum time taken by a ray to exit the plane CD is t × 10⁻⁹s, where t is ________

A planar structure of length L and width W is made of two different optical media of refractive indices n1=1.5 and n2=1.44 as shown in figure. If L>>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=9.6m, if the incident angle θ is varied, the maximum time taken by a ray to exit the plane CD is t × 10⁻⁹s, where t is _________. [Speed of light c=3 × 10⁸m/s]

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