Focal Length: cm-1 Conversion | 0.0759cm-1

AI Thread Summary
The focal length of a concave mirror is expressed in units of length, not inverse length. The value 0.0759 cm-1 represents the reciprocal of the focal length (1/f). To find the actual focal length (f), one must take the inverse of 0.0759 cm-1, resulting in a focal length of approximately 13.18 cm. This conversion clarifies the initial confusion regarding the units. Understanding the relationship between focal length and its reciprocal is essential for accurate calculations in optics.
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I am doing an assignment for school about the focal length of a concave mirror.
I found that the focal length for the mirror was 0.0759cm-1
But, how much is that really in terms of cm? So basically, 0.0759cm-1 = ?cm

Thanks ;D
 
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Focal length has units of length, not inverse length. What you probably found was 1/f, not f. Check over your equations and see if that's the problem.
 
Hmm, so if that is 1/f then f would be the inverse of that?
So it would be 0.0759cm? =o
 
No. If 1/f = 0.0759 cm-1, then f = 1/0.0759 cm.
 
Oh, right :redface:

So, 1/0.0759 = 13.18cm

Sorry for my dumb questions, but it's the first time I'm doing this so I'm pretty much confused :blushing:
 

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