A prism of R, I. $\sqrt{2}$ and apex angle A is (in air) shown. Light is incident from PQ side  at angle of incidence i. 

$(0<i< {90}^o).$ Choose the correct options. 

 

If $A={80}^o$ then light incident at some angles will be refracted and at some other  angles light will be reflected.

If $A={92}^o$ then light incident at all angles will be reflected back from side PR.

Whatever is the value of A, light definitely emerge from the surface PR.

If $A={40}^o$ then light incident at all angles will be refracted from surface PR