a dentist uses mirror in front of decayed Tooth at a distance of 7cm form the tooth to get 4cm times magnified image. use formula to find focal length and nature of mirror used
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so here ,m=-4.and the object distance (u)=-7cm.so m=-v/u,or v=-28cm.
and 1/v+1/u=1/f
or, f =-28/5cm.,so the focal length is negative then it is a concave mirror. it is a converging mirror.
and 1/v+1/u=1/f
or, f =-28/5cm.,so the focal length is negative then it is a concave mirror. it is a converging mirror.
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