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

[zuzu23]

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

 

[Doc Al]

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.

 

[zuzu23]

Hmm, so if that is 1/f then f would be the inverse of that?
So it would be 0.0759cm? =o

 

[Doc Al]

No. If 1/f = 0.0759 cm-1, then f = 1/0.0759 cm.

 

[zuzu23]

Oh, right

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