Bellows Lens
Camera problem Help?
The bellows of an adjustable camera can be extended so that the largest distance from the lens to the film is 1.68 times the focal length.
If the focal length of the lens is 7.32 cm, what is the distance from the closest object that can be sharply focused on the film?
Answer in units of cm.
Use the equation:
1/S1 + 1/S2 = 1/f
Given: S2 = 1.68 * f
S1 = (1/f – 1/S2)^-1 = (1/f – 1/1.68f)^-1 = ((1.68f – f)/1.68f²)^-1
= (0.68/1.68f)^-1 = (0.68/(1.68*7.32cm))^-1 = 18.0847cm
Answer: 18.1 cm
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