How far is the object from the mirror and what is the curvature?

  • Thread starter xswtxoj
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  • #1
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Homework Statement



An object is placed 15cm from a certain mirror, the image is half the size of the object, upright, and virtual. how far is the image fromt he mirror, and what is the radius of curavature of the mirror?

Homework Equations


1/f = 1/p + 1/q

f= r/2


The Attempt at a Solution


1/f = 1/p + 1/q
1/15= 1/-7.5

1/q = 1/5cm

f= r/2
r=f*2
15*2= 30cm
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
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1/f = 1/p + 1/q
1/15= 1/-7.5
This step is wrong.
It should be
1/f = 1/p + 1/q
1/f = 1/15 + 1/-7.5
 
  • #3
87
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so base on what was corrected the answer is -1/15cm is how far is the image from the mirror, and what is the radius of curavature of the mirror is f= r/2
r=f*2
-1/15*2= -2/15cm?
 
  • #4
87
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oh i mean -30cm for r
 
  • #5
rl.bhat
Homework Helper
4,433
8


Yes.
 

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