A planar structure of length L and width W is made of two different optical media of refractive indices n = 1.5 and n = 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 = 9.6 m, if the incident angle 0 is varied, the maximum time taken by a ray to exit the plane CD is tx 10 s, where t is [Speed of light c = 3 108 m/s] Air 0 A B n 11 L n D W