An equilateral prism is placed on a horizontal surface. $A$ ray $PQ$ is incident onto it. For minimum deviation:

$A$ light ray is incident by grazing one of the faces of a prism. After refraction,the ray does not emerge out from the other face. What should be the angle of the prism if the critical angle is $C$?

The refraction through the prisms is as shown. Pick out the wrong statement from the following. Path of the light ray in

$A$ glass prism deviates the red and violet rays through $9^{\circ}$ and $11^{\circ}$ respectively. $A$ second prism of equal angle deviates them through $11^{\circ}$ and $13^{\circ}$ respectively. The ratio of dispersive power of the second prism to the first prism is

The figures represent three cases of a ray passing through a prism of angle $A$. The case corresponding to minimum deviation is

$A$ graph is plotted between angle of deviation $(\delta)$ and angle of incidence $(i)$ for a prism. The nearly correct graph is