The principal section of a glass prism is an isosceles triangle A B C with A B=A C . The face A C is silvered. A ray of light is incident normally on the face A B and after two reflections, it emerges from the base B C perpendicular to the

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The principal section of a glass prism is an isosceles triangle A B C with A B=A C . The face A C is silvered. A ray of light is incident normally on the face A B and after two reflections, it emerges from the base B C perpendicular to the base. Angle B A C of the prism is

Quantrex Academy · Accepted Answer

Correct answer: B. 36^

array llrl & i₁ =90^ - (90^ -A )=A and & =90^ -21₁=90^ -2 A & i₂ =90^ - =90^ - (90^ -2 A )=2 A & =90^ -i₂=90^ -2 A array From the geometry of the figure aligned & A+2 A+2 A=180^ & A=36^ aligned

The principal section of a glass prism is an isosceles triangle A B C with A B=A C . The face A C is silvered. A ray of light is incident normally on the face A B and after two reflections, it emerges from the base B C perpendicular to the base. Angle B A C of the prism is

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