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In the given figure, the principal secti...

In the given figure, the principal section of a glass prism is an isosceles triangle ABC with AB = AC. The face AC is silvered. A ray incident normally on face AB, after two reflection, emerges from the the base BC in a direction perpendicular to it. What is the angle `angleBAC` of a prism?

A

`30^@`

B

`36^@`

C

`60^@`

D

`72^@`

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