A person, examining an object, brings it closer to his eyes. Does the lens curvature change (if so, how)?

1. The curvature of the lens increases.
2. The lens plays the role of a collecting lens, and the retina plays the role of a screen on which the image of the object is obtained. When an object approaches a collecting lens (for distances greater than the focal length), the actual image of the object moves away from the lens. To ensure that the position of the focused image of an approximate object relative to the center of the lens (lens) does not change, it is necessary to increase the optical power of the lens. An increase in optical power occurs due to an increase in the curvature of the lens.