SOLUTION: The lens of a camerahas a focal length (F) that satisfies the equation. F= do x dk/(do + dk) where do is the distance from the object to the lens and dk is the distance fro

Question 437278: The lens of a camerahas a focal length (F) that satisfies the equation.
F= do x dk/(do + dk)
where do is the distance from the object to the lens and dk is the distance from the lens to the film.
If an object is 60 cm from the cam lens and the lens is 10 cm from the film, what is the approximate focal length in centimeters of the lens?
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
F=do x dk/(do+dk)
"=60 x 10/60+10
"=60 x 10/70
"=60/7 cm..
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