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.

20 cm, the image formed is erect and magnified only if the object is placed between the pole and focus of the concave mirror.


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