Question

A planar structure of length L and width W is made of two different optical media of refractive indices and as shown in figure. If , a ray entering from end AB will emerge from end CD only if the total internal reflection condition is met inside the structure. For m, if the incident angle is varied, the maximum time taken by a ray to exit the plane CD is s, where t is _________. [Speed of light m/s]

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Correct option is A)





Total length travel by light



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