$A$ light ray is incident perpendicular to the plane of a mirror. The angle of reflection will be ......$^o$.

Two plane mirrors are inclined at an angle of $72^{\circ}$. The number of images of a point object placed between them will be

When a plane mirror is placed horizontally on a level ground at a distance of $60 \ m$ from the foot of a tower,the top of the tower and its image in the mirror subtend an angle of $90^\circ$ at the eye. The height of the tower will be.....$m$.

To get three images of a single object, one should have two plane mirrors at an angle of $...^\circ$.

$A$ mirror is inclined at an angle of $\theta$ with the horizontal. If a ray of light is incident at an angle $\theta$ with the mirror,then the reflected ray makes the following angle with the horizontal:

When a plane mirror is rotated through an angle $\theta$,the reflected ray turns through an angle $2\theta$. What happens to the size of the image?