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What is the small index of refractive of...

What is the small index of refractive of the material of a right angled prism with equal sides for which a ray of light entering one of the sides normally will be totally reflected ?

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The ray XO enters through the side PQ normally and is incident on PR at an angle of `45^(@)`. It will be totally reflected along OY if the critical angle for the prism.s material is `45^(@)`.
`therefore" Refractive index of material of prism is "`
`mu=(1)/(sin45^(@))=sqrt2=1.414`
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