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A dentist uses a small mirror to make a 4 x upright image of a tooth placed 1 . 8 cm in front of the

A dentist uses a small mirror to make a $4$ x upright image of a tooth placed $1.8$ cm in front of the mirror.

$($ a $)$ What kind of mirror should she use?

$($ b $)$ What will be the focal length of the mirror?

$($ c $)$ What will be the radius of curvature of the mirror?

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