Question
Tue October 09, 2012 By:
 

Calculate the distance of an object of height h from a concave mirror of focal length 10 cm so as to obtain a real image of magnification 2.

Expert Reply
Tue October 09, 2012
objet distance=u=-h
f=-10 cm
m=-2=-v/u
v=-2h
putting in the mirror formula:
1/v+1/u=1/f
1/-2h+1/-h=1/-10
h=15cm
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