Question

A mirror at an amusement park shows an upright image of any person who stands 0.8 m in front of it. If the image is three times the person's height, what is the radius of curvature? 

Please Help!

Answer 1

di/do=hi/ho

    di/do  =3

di=3*0.8=2.4

Using mirror equation.

f=dodi/(do+di)

  =0.8*2.4/(0.8+2.4)

  =0.6 m

Radius of curvature

R=-2f

   =-1.2 m