First slide
Ray optics

An equilateral prism ABC is placed in air with its base side BC lying horizontally along x-axis. A light ray 3z+x=10  is incident at a point P on face AB of the prism.

If  μ for the prism is 32 , then net deviation of the ray as it emerges out of the prism is


For μ=32,  total internal reflection takes place at AC. From geometry, it in clear that ray 
in perpendicular incident on BC, so net deviation = 180o-120o=60o,  only at AC.

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