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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 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. |
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Answer» 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. |
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