The refractive index of water is 4 / 3 a...

The refractive index of water is 4 / 3 and that of glass is 5/3. What will be the critical angle for the ray of light entering water from the glass

`"sin"^(-1) 4/5`

`"sin"^(-1) 5/4`

`"sin"^(-1) 1/2`

`"sin"^(-1) 2/1`

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