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Optics: What is the magnification using a camera lens with focal length of 30 cm?

A camera is equipped with a lens with a focal length of 30 cm. When an object 200 cm away is being photographed, what is the magnification?

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1/v -1/u = 1/f
here u = -200, f = +30
=> 1/v +1/200 = 1/30
=> 1/v = 17/600
m = I/O = v/u = 600/(17*200) = 3/17 Answer