A glass prism has a right-triangular cross section, $ABC$, with $\angle A=90°$. A ray of light parallel to the hypotenuse, $BC$ and, incident on the side, $AB$ emerges grazing the side, $AC$. Another ray, again parallel to the hypotenuse, $BC$, incident on the side, $AC$ suffers total internal reflection at the side, $AB$. Which one of the following must be true about the refractive index, $\mu$ of the material of the prism?

Consider two equivalent, triangular hollow prisms A and B made of thin glass plates and arranged with negligible spacing as shown in the figure. A beam of white light is incident on prism A from the left. Given that, the refractive index of water is inversely related to temperature, the beam to the right of prism B would not appear white, if

A rectangular block is composed of three different glass prisms (with refractive indices ${\mu }_1, {\mu }_2 \mathrm{a}\mathrm{n}\mathrm{d} {\mu }_3$ ) as shown in the figure below. A ray of light incident normal to the left face emerges normal to the right face. Then the refractive indices are related by

The angle of deviation through a prism is minimum when 

(A) Incident ray and emergent ray are symmetric to the prism

(B) The refracted ray inside the prism becomes parallel to its base

(C) Angle of incidence is equal to that of the angle of emergence

(D) When angle of emergence is double the angle of incidence

Choose the correct answer from the options given below :