A camera lens has a focal length of $200 \mathrm{~mm}$. How far from the lens should the subject for the photo be if the lens is $20.4 \mathrm{~cm}$ from the film?
Added by Francisco Jose B.
Step 1
Step 1: Use the lens formula 1/s' + 1/s = 1/f, where s' is the distance of the image, s is the distance of the object, and f is the focal length. Show more…
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