A concave mirror has a focal length of 22 Cm. At which of the following distance should a person hold his face from this concave mirror so that it may act as a shaving mirror ?

(a) 45 cm

(b) 20 cm

(c) 25 cm

(d) 30 cm

Give reason for your choice.

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

A virtual, erect and magnified image of an object is to be produced with a concave mirror of focal length 14 Cm. Which of the following object distance should be chosen for this purpose ?

(i) 10 Cm (ii) 15 Cm (iii) 20 Cm

Give reasons for your choice.

An object is placed at the following distances from a concave mirror of focal length 16 cm, turn by turn:

(a) 36 cm

(b) 32 cm

(c) 21 cm

(d) 9 cm

Which position of the object will produce:

(i) a magnified real image?

(ii) a magnified virtual image?

(iii) a diminished real image?

(iv) an image of same size as the object?

According to the "New Cartesian Sign Convention" for mirrors, what sign has been given to the focal length of:

(i) a concave mirror?

(ii) a convex mirror ?