If the incident ray is stationary, but the plane mirror rotates by an angle of ${30}^{\circ }$, then the reflected ray gets rotated by .

Q. If the incident ray is rotated by an angle of ${30}^{\circ }$ while the plane mirror is at rest, the reflected ray gets rotated by .

Q. For a ray incident on a plane mirror as shown, if mirror is rotated by $1^{\circ }$ in direction given in the diagram, reflected ray rotates by

Q. For a given incident ray, if the plane mirror is rotated through an angle of $\theta$ the reflected ray rotates through an angle

Q. A ray of light is incident on a horizontal plane mirror at an angle of incidence ${30}^o$. By what angle should the mirror be rotated so that the reflected ray becomes horizontal?