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

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

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

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 :

An object is 200 mm in front of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is:

A) less than 200 mm

B) between 200 mm and 400 mm

C) exactly 400 mm

D) more than 400 mm