A parallel beam of light is made incident (as shown) on the flat...

Options

1. ALight rays come out at the curved surface for values of $\theta$ in the range $75^{{}^{{}^{\circ}}} \leq \theta \leq 165^{{}^{{}^{\circ}}}$.
2. BThe range of angle $\theta$ is independent of the angle of incidence.
3. CThe range of angle $\theta$ depends on the refractive index of the material
4. DAll the emergent rays of light shall cross the line OP which is a refracted ray at $\theta=120^{{}^{{}^{\circ}}}$ Here $\theta$ is the angle between the vertical diameter AB and the concerned radius of the semicircular sheet of radius $R$.