An isosceles glass prism with base angle...

An isosceles glass prism with base angles `40^(@)` is champed over a tray of water in a position such that the base is just dipped in water. A ray of light incident normally on the inclined face suffers total internal reflection at the base. If the refractive index of water is `1.33` then the condition imposed on the refractive index `mu` of the glass is -

`mu lt 2.07`

`mu gt 2.07`

`mu lt 1.74`

`mu gt 1.74`

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