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  4. One face AC of the glass prism is silvered as shown and the principal section of a glass prism is an isosceles triangle ABC with AB=AC. The ABAC, if the ray incident normally on the face AB and after two reflections, it energies from the base BC. perpendicular to it, is:

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Q. One face AC of the glass prism is silvered as shown and the principal section of a glass prism is an isosceles triangle ABC with AB=AC. The ABAC, if the ray incident normally on the face AB and after two reflections, it energies from the base BC. perpendicular to it, is:Physics Question Image

EAMCETEAMCET 2004Ray Optics and Optical Instruments

Solution:

$ \alpha +2\beta ={{180}^{o}} $ and $ \beta =2\alpha $ $ \alpha ={{36}^{o}} $

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