The principal section of a glass prism is an isosceles triangle ABC with AB=AC. The face AC is silvered. A ray of light is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to the base. Angle BAC of the prism is : Need clear explanation..

The principal section of a glass prism is an isosceles triangle ABC wi

1.	The principal section of a glass prism is an isosceles triangle ABC with AB=AC. The face AC is silvered. A ray of light is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to the base. Angle BAC of the prism is : Need clear explanation..
Answer» let FIRST angle of incidence I=90°- (90-a)=aand alpha=90°-2i=90°-2athe second time ANGEL of incidence I=90°-alpha=90°-(90°-2a)=2abeta=90°-i=90°-2afrom GEOMETRY as given in the questiona+2a+2a=180°5a=180°a=180°/5a=36°I hope it is useful for you.plz mark it in BRAIN LIST

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The principal section of a glass prism is an isosceles triangle ABC with AB=AC. The face AC is silvered. A ray of light is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to the base. Angle BAC of the prism is : Need clear explanation..

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