For a plane mirror,the focal length is . . . . . . $m$.

When one light ray is reflected from a plane mirror with $30^{\circ}$ angle of reflection,the angle of deviation of the ray after reflection is $.....^{\circ}$

If $\hat{n}_1, \hat{n}_2$ and $\hat{t}$ represent unit vectors along the incident ray, reflected ray, and normal to the surface respectively, then:

$A$ laser beam is incident on a plane mirror at some angle and results in a reflected beam. The mirror is now rotated by an angle $\delta$ while the direction of the incident laser beam is kept the same. The angle between the new reflected beam and the reflected beam before the mirror was rotated is

What is reflection of light? Explain the laws of reflection.

Find the angle of deviation for the given diagram.