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A ray of light incident normally on one face of a right isosceles prism is totally reflected. What must be the minimum value of refractive index of glass ? Give relevant calculations.

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Here `45^(@)gtC`
`becausesinC=1/mu`
`thereforesin45^(@)gt1/muor1/sqrt2gt1/muormugtsqrt2`
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AAKASH INSTITUTE ENGLISH-RAY OPTICS AND OPTICAL INSTRUMENTS-EXAMPLE
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