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A concave mirror has a focal length of 2...

A concave mirror has a focal length of 25 cm. At which of the following distace should a person hold his fce from this concave mirror so that it may act as a shaving mirror ?
(a) 45 cm
(b) 20 cm
25 cm
(c ) 25 cm
(d) 30 cm
Give reason for your choice.

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