Asked by Lena

i`m being asked to find the focal length. I know that the distance from the lens to the object is 35 cm and that the distance from the image to the lens is 27 cm. I did the following:

1/27 + 1/35 = 1/f
62/945=1/f
15 15/62 = f

Did I do this correctly?
Answered by Reiny
your calculations are correct
Answered by Lena
is my di equal to my focal length?
Answered by Lena
Like one of my questions asks compare your measured focal length to your calculated focal length. So would my di = my focal length in the experiment?
Answered by Reiny
I don't know the physics behind this, I just assumed your equation was correct.

Your math is correct based on the equation you used.
Answered by Lena
Thanks so much :)
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