
#1
Apr712, 12:56 AM

P: 2

1. The problem statement, all variables and given/known data
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? 2. Relevant equations tan(θ)=h/di f=1/2R? 3. 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? 



#2
Apr712, 01:44 PM

Mentor
P: 11,984

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
Apr712, 01:58 PM

P: 210

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
Apr912, 12:41 AM

P: 2

Finding image location with concave mirror
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!



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