ACB is right-angled glass prism of refra...

ACB is right-angled glass prism of refractive index 1.5 . `/_A` ` /_B` and `/_C` are `60^@` ` 30^@` and `90^@` respectively.A thin layer of liquid is on the AB. For a ray of light which is incident normally on AC to be totally reflected at AB the refractive index of the liquid on AB should be

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