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=9.6m, if the incident angle theta is varried, the maximum time taken by ray to exit the plane CD is t x 10^(-9) S, where t is ___ [Speed of light c=3xx 10^(8) m/s]

A planar structure of length L and width W is made of two different op

1.	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=9.6m, if the incident angle theta is varried, the maximum time taken by ray to exit the plane CD is t x 10^(-9) S, where t is ___ [Speed of light c=3xx 10^(8) m/s]
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