- 05/10/2019 at 5:40 am #799527EduGorillaKeymasterSelect Question Language :
The principal section of a glass prism is an isosceles triangle ABC with AB = AC. One face AC of the glass prism is silvered as shown in the figure. If a ray is incident normally on the face AB and after two reflections, it emerges from the base BC perpendicular to it, what is the measure of angle BAC?
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