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=9.6 m, if the incident angle θ is varied, the maximum time taken by a ray to exit the plane CD is t×10−9 s, where t is. [Speed of light c=3×108 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 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=9.6 m, if the incident angle θ is varied, the maximum time taken by a ray to exit the plane CD is t×10−9 s, where t is. [Speed of light c=3×108 m/s]
Answer» 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 $L >> W$ , 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 $θ$ is varied, the maximum time taken by a ray to exit the plane CD is $t \times 10^{- 9} s$ , where $t$ is. [Speed of light $c = 3 \times 10^{8} m / s$ ]