A ray of light is incident normally on one face of an equilateral glass prism of refractive index

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19. A ray of light is incident normally on one face of an equilateral glass prism of refractive index . When the prism is completely immersed in a transparent medium, it is observed that the emergent ray just grazes the adjacent face. Find the refractive index of the medium.
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Refractive index is u/√2 is given in reference book ???

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