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A triangular medium has varying refracti...

A triangular medium has varying refracting index `mu = mu_(0) + ax` where x is the distance (in cm) along x-axis from origin and `m_(0) = 4//3`. A ray is incident normally on face OA at the mid-point of OA. Find the range of value of a so that light does not escape through face AB when it falls first time on the face AB.

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The correct Answer is:
`a gt (2)/(9)`
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