Finding image location with concave mirror

  • #1

Homework Statement


A small object is located 32.0cm in front of a concave mirror with a radius of curvature of 40.9cm.
Where will the image be formed?


Homework Equations



tan(θ)=-h/di
f=1/2R?

The Attempt at a Solution



Haven't been able to solve for theta. I'm not sure what equation to use, but I'm guessing that the radius is important. Do I need to find the focal length?
 

Answers and Replies

  • #2
Redbelly98
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Welcome to Physics Forums.

Yes, you need to find the focal length first. And, your text book should have a formula that relates focal length to the positions of the object and image, that will be helpful here.
 
  • #3
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you do need to know the focal length. You have to be careful with equations. focal length =R/2 not....1/2R....do you see what I mean/
 
  • #4
Ohhhh, I see. I use 1/do + 1/di = 2/R (which is the focal point, & the reason the difference is indicated). Thank you both!
 
  • #5
Redbelly98
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Yes, that's the idea. You're welcome!
 

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