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Two identical equilat- eral glass (refra...

Two identical equilat- eral glass (refractive index `= sqrt(2))` prisms ABC and CDE are kept such that the angle between faces AC and CE is q. A ray of light is incident at an angle i at the face AB and traverses through the two prisms along the path PQRSTU. Find the value of angle i and `theta` such that angle between the incident ray PQ and emergent ray TU is minimum.

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