Finding image location with concave mirror

by physiquephys
Tags: concave, image, location, mirror
 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?
 Mentor P: 11,898 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.
 P: 211 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/
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!
 Mentor P: 11,898 Yes, that's the idea. You're welcome!

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