Two plane mirrors $M_1$ and $M_2$ are at right angle to each other shown. A point source $P$ is placed at $a$ and $2a$ meter away from $M_1$ and $M_2$ respectively. The shortest distance between the images thus formed is : (Take $\sqrt{5}=2.3$)

A mirror is placed at an angled of $30°$ with respect to $y-$axis (see figure). A light ray travelling in the negative $y-$direction strikes the mirror. The direction of the reflected ray is given by the vector

The refractive index of the material of the prism and liquid are $1.56$ and $1.32$, respectively. What will be the value of $\theta$ for the following refraction?

A monochromatic beam of light is incident at the interface of two materials of refractive index $n_1$ and $n_2$ as shown. If $n_1>n_2$ and ${\theta }_{\mathrm{c}}$ is the critical angle then which of the following statement is true?

The refractive indices of the material of the prism and liquid are $1.56$ and $1.32$, respectively. What will be the value of $\theta$ for the above refraction?