How we can determine The diameter of the lens of the camera approximitly that this picture took with that?
( we know that lens of the camera made by some parts but we count them as a thin one in Practical calculations )
m = q / p 1/f = 1/q + 1/p f = f/p-f f : Focal length q = Distance between of the object and the lens
p = Distance between of the image and the lens m = Magnification
The Attempt at a Solution
i tried to find lens Magnification by calculating the distance between every centimeter of the ruler and then find its Magnification ( m ) . after that i used this formula 1/f = 1/p + 1/q
so i got f Terms p now i don't know how i must find its diameter .