If a ray of light passes through an equilateral prism such that the angle of incidence and the angle of emergence are both equal to $70 \%$ of the angle of the prism,then the angle of deviation is (in $^{\circ}$)

$A$ ray of light is incident at an angle of $9.3^{\circ}$ on one face of a small-angle prism with a refracting angle of $6^{\circ}$. If the ray of light emerges normally from the second face,the refractive index of the material of the prism is:

$A$ thin prism $P_1$ with angle $4^{\circ}$ made of glass having refractive index $1.54$ is combined with another thin prism $P_2$ made of glass having refractive index $1.72$ to produce dispersion without deviation. The angle of the prism $P_2$ in degrees is:

$A$ yellow light undergoes minimum deviation through a prism. If $i_1$ and $i_2$ are the angle of incidence and the angle of emergence respectively,then:

Which of the following prisms is used to see the infrared spectrum of light?

$A$ ray of light is incident on a $60^{\circ}$ prism at the minimum deviation position. The angle of refraction at the first face (i.e.,incident face) of the prism is.......$^{\circ}$