1.

A dentist uses a mirror in front of a decayed tooth at a distanceof 1 cm from the tooth to get a 2 times magnified image. Findthe focal length of mirror, nature of image and nature of mirror.2

Answer»

Object distance, u = -1 cmmagnification, m= 2we know, m = -v/u ⇒ v = -mu ⇒ v = -(1)(-2) = 2 cmso image distance= 2 cmnow, by mirror formula , 1/v + 1/u = 1/f⇒ 1/2 + 1/--1 = 1/f⇒ -1+2/-2 = 1/f⇒ 1/f = 1/+2∴ focal length = -2.0 cmonly a concave mirror can form magnified images.since the image is formed behind the mirror, it is virtual and erect



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