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An isosceles triangular glass prism stan...

An isosceles triangular glass prism stands with its base in water as shown. The angles that its two equal sides make with the base are `theta` each. An incident ray of light parallel to the water surface internally reflects at the glass-water interface and subsequently re-emerges into the air. Taking the refractive indices of glass and water to be 3/2 and 4/3 respectively, show that  must be at least `tan^(-1) 2/sqrt(17)` or `25.9^(@)`.

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