A ray of light falls normally on one face of a prism of angle `45^@`. If critical angle for material of the prism is `45^@`, trace the course of rays, calculate `mu`.
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The incident ray `PQ` falling normally on face `AB` of prism, goes staifgt striking face `AC` at `45^(@)` as shown in Fig. 16. As `C = 45^(@)`, therefore, the refracted ray `QR` suffers total internal reflection and goes along `RD`.
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