Solving Camera Lens Problem for Film Size of 24x36mm

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The discussion focuses on calculating the distance a subject should stand from a camera to achieve a specific image size on 35-mm film, which measures 24 mm x 36 mm. The relevant formula for this calculation is hi = -(f/do - f)ho. A participant initially calculated the distance as 22.4 cm but found it to be incorrect. The suggestion was made to convert all lengths to meters and then solve for the object distance (do). Accurate calculations are essential for achieving the desired image size in photography.
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The actual frame size of "35-mm" film is 24 mm x 36 mm. You want to take a photograph of your friend, who is 1.70 m tall. Your camera has a 60.0 mm focal length lens. How far from the camera should your friend stand in order to produce a 36.0 mm-tall image on the film?



i thought you would use the equation hi=-(f/do-f)ho




I did this and i got 22.4 cm. which is wrong. please help I am stuck
 
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Your formula is correct.
Convert all lengths to meter and find do.
 
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