At what angle should a ray of light be i...

At what angle should a ray of light be incident on the face of a prism of refracting angle `60^(@)` so that it just suffers total internal reflection at the other face? The refractive index of the material of the prism is 1.524.

`41^@`

`19^@`

`30^@`

`60^@`

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The correct Answer is:

`30^@`

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