Adjusting Camera Lens for Sharp Image: 72.0mm Focal Length at 1.90m Distance

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To achieve a sharp image of an object 1.90 m away with a 72.0 mm focal length lens, the lens must be adjusted based on the lens formula: 1/focal_length = 1/object_distance + 1/image_distance. By substituting the known values into the formula, the required image distance can be calculated. The lens will need to be moved closer to the film to focus properly on the nearer object. This adjustment ensures that the image projected onto the film is sharp and clear. Understanding this principle is crucial for effective camera operation and image clarity.
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Figure 36.36 diagrams a cross-section of a camera. It has a single lens of focal length 72.0 mm, which is to form an image on the film at the back of the camera. Suppose the position of the lens has been adjusted to focus the image of a distant object. How far and in what direction must the lens be moved to form a sharp image of an object that is 1.90 m away
 
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The rule you need is.
1/focal_length = 1/object_distance + 1\image_distance
 

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