The focal length of a small concave mirror is 2.5 cm. In order to use this concave mirror as a dentist's mirror, the distance of tooth from the mirror should be:(a) 2.5 cm (b) 1.5 cm (c) 4.5 cm (d) 3.5 cm

(b) 1.5 cm

Explanation

The focal length of a small concave mirror is given 2.5 cm. In order to use this concave mirror as a dentist's mirror, the distance of the tooth from the mirror should be less than the focal length of the mirror which is 1.5 cm, because when an object is placed between the pole and the focus of a concave mirror, an enlarged image is formed. And, here except option (b) 1.5 cm, all the given option has distance beyond the focal length of the mirror.

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Updated on: 10-Oct-2022

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