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When the ray starts from the runway its angle with the normal will be p/2. Let the angle with which it emerges at any height be q. Then the Snell's law gives us n1(1+ay)sinq = n1 or sin q = 1 / (1+ay) also tan q = dx / dy, solving the differential equation with limits for x as 0 to x and for y 0 to 1.7m, we get the value of x required.
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Moderation Team
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