By properly combining two prisms made of different materials, it is possible to have

The refractive index of material of prism shown in figure is

Light is incident normally on the short face of a $30°-60°-90°$prism. A liquid is poured on the hypotenuse of the prism. If the refractive index of the prism is $\sqrt{3}$ , find the maximum refractive index of the liquid so that light is totally reflected

In the figure $ABC$ is the cross-section of a right angled prism and $BCDE$ is the cross-section of a glass slab. The value of $\theta$. So that light incident normally on the face $AB$ does not cross the face $BC$ is (given ${\sin }^{-1}\left(\frac{3}{5}\right)=37°$ )

Where, $\angle BAC=\theta$.

$n$ number of identical equilateral prisms are kept in contact as shown in figure. If deviation through a single prism is $\delta$. Then ( $n, m$ are integers)

A plane mirror is placed horizontally inside water $\left(\mu =\frac{4}{3}\right).$ A ray falls normally on it. The mirror is rotated by angle $\theta$ such that after reflection, the ray does not come out of water. The minimum value of $\theta$ is

Figure shows a torch sending a parallel beam of light fixed on a wall and a plane mirror which forms a spot on the wall. As the mirror moves towards the wall, the spot on the wall moves