a concave mirror has a focal length of 25 cm . at which of the following distance should a person hold his face from concave mirror so that it may act as a shaving mirror?
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a concave mirror has a focal length of 25 cm . at which of the following distance should a person hold his face from concave mirror so that it may act as a shaving mirror?
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Answer:
it should be at 20cm because concave mirror gives erect and virtual image of the object