Question

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 cm
Give reason for your choice.

Answer 1

Answer:

20 cm

Explanation:

In the case of a concave mirror,

• When the image is placed between focus and the pole of the concave mirror, it forms a virtual, enlarged and erect image.

• This property is useful in the case of a shaving mirror to form an enlarged and erect image.

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Answer 2

Answer:

20

Explanation:

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