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Old Feb 14th 2011, 11:14 AM   #1
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Concave spherical mirror in a car headlamp

I'm given only the object distance from the mirror. How would I find the focal length?
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Old Feb 14th 2011, 12:12 PM   #2
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Originally Posted by Tesoro72 View Post
I'm given only the object distance from the mirror. How would I find the focal length?
Have you tried looking this up on your text? Or on-line? There is a simple formula based on the radius of the mirror.

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Old Feb 17th 2011, 01:52 PM   #3
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I couldn't find a simple equation in the book, but my teacher reviewed the assignment
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Old Feb 17th 2011, 02:29 PM   #4
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Originally Posted by Tesoro72 View Post
I couldn't find a simple equation in the book, but my teacher reviewed the assignment
For the record f = -R/2 where R is the radius of the mirror.

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