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Question $8$ of $12$

The angle of deviation $$ through a triangular prism is defined as the angle between the incident ray and the emerging ray. For an isosceles triangular prism, the angle of the prism is $A=32\mathrm{.}0$ and the angle of deviation has its minimum value, which is ${}_{\text{m}\text{i}\text{n}}=26\mathrm{.}0.$