The angle of incidence for a ray of light passing through the centre of curvature of a concave mirror is:

The image formed by a concave mirror is real, inverted and of the same size as the object. The position of the object must then be:

The image formed by a concave mirror is real, inverted and highly diminished (much smaller than the object). The object must be:

In the concave reflector of a torch, the bulb is placed:

The focal length of a small concave mirror is 2.5 cm. In order to use this concave mirror as a dentist's mirror, the distance of tooth from the mirror should be :