Mirror problem

  • Thread starter myoplex11
  • Start date
  • #1
myoplex11
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Homework Statement



an image in a convex mirror is 12cm tall and 30cm from the mirror.IF the focal length is 50cm, where is the object and how tall.

Homework Equations



(1/f)=(1/do)+(1/di)
M= hi/ho =-di / do

The Attempt at a Solution


i got 7.5cm for the object height but a convex mirror always gives a reduced image?
 

Answers and Replies

  • #2
alphysicist
Homework Helper
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Hi myoplex11,

It's difficult to follow since you did not post the actual numbers that you used.

However, I think the problem is that you either put in the incorrect image distance, or the incorrect focal length.
 
  • #3
myoplex11
45
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here is my work:
(1/do)=1/50 - (-1/30)
do=18.75
ho= - (18.75/-30)*12 = 7.5
 
  • #4
alphysicist
Homework Helper
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Since this is a convex mirror, what do you know about the focal length?
 
  • #5
myoplex11
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i am not sure
 
  • #6
myoplex11
45
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oh yeah focul length is negative thanks.
 

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