A concave mirror has a focal length of 25 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 cmGive reason for your choice.

A person must hold his face at a distance of 20 cm away from the concave mirror so that it may act as a shaving mirror. This is because a concave mirror forms an erect, virtual and magnified image when an object is placed within the focus $F$, (or, between the focus $F$ and the pole $P$). Hence, it acts as a shaving mirror.

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Updated on: 10-Oct-2022

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