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What is the minimum value of the refract...

What is the minimum value of the refractive index for a `90^(@)-45^(@)-45^(@)` prism which is used to deviate a beam through `90^(@)` by total internal reflection ?

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At face AB the ray of light suffers no deviation if the incident normally.
At face AC, the light ray undergoes TIR, so angle of incidence at the face AC is greater than critical angle
`45^@ gt C, sin 45^@ gt sin C, 1/sqrt2 gt 1/mu, mu gt sqrt2`
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