Question

A 2.0 cm high object is placed on the principal axis of a concave mirror at a distance of 12 cm from the pole. Ilf the image is inverted, real and 5.0 cm high, find the location of the image the focal length of the mirror.

Answer 1

Given `O=2cm`,`u=-12cm`,`I=-5cm`
`(I)/(O)=-(v)/(u)`
`(-5)/(2)=-(v)/(-12)impliesv=-30cm`
`(1)/(f)=(1)/(v)+(1)/(u)=(1)/(-30)+(1)/(-12)=(2+5)/(-60)`
`f=-(60)/(7)cm`