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Spherical Mirrors an ray diagram

  • Thread starter Pius
  • Start date
  • #1
16
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Homework Statement


When an object is located very far away from a convex mirror, the image of the object is 18 cm behind the mirror. Using a ray diagram drawn to scale determine where the image is located when the object is placed 9.0 cm in front of this mirror. Note that the mirror must be drawn to scale also. In your drawing, assume that the height of the object is 3.0 cm.


Homework Equations


hi/h0=[-di/d0=di-f/f] 1/di=1/f-1/di
di/d0=di/f-1 1/di+1/di=f

The Attempt at a Solution


d0=infinite
1/infinite+1/di=1/f
f=-18.0 cm

d0=9.00cm
1/9.00+1/di=1/-18
di=-18

-18/9=hi/3
hi= -6.00cm

?!but when I draw this it doesn't equal to -6cm
 
Last edited:

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
5
d0=9.00cm
1/9.00+1/di=1/-18
di=-18

Check this calculation.
 
  • #3
16
0
Yush! It worked! Thanks a bunch!
 

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