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Finding image location with concave mirror

by physiquephys
Tags: concave, image, location, mirror
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physiquephys
#1
Apr7-12, 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?
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Redbelly98
#2
Apr7-12, 01:44 PM
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P: 12,068
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.
Emilyjoint
#3
Apr7-12, 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/

physiquephys
#4
Apr9-12, 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!
Redbelly98
#5
Apr9-12, 06:30 PM
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P: 12,068
Yes, that's the idea. You're welcome!


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