Question

The observer 'O' sees the distance AB as infinitely large. If refractive index of liquid is $\mu_1$ and that of glass is $\mu_2$, then $\frac{\mu_1}{\mu_2}$ is -

Answer 1

sqrt(2)

Answer 2

The limiting condition for a ray emerging at the edge leads via Snell’s law to $\mu_1\sin\theta_c=\mu_2$ with $\theta_c=45^\circ$ so that $\frac{\mu_1}{\mu_2}=1/\sin45^\circ=\sqrt2$.