Answer :

Final answer:

The focal length of a convex lens changes as the sides of the lens become less curved due to the relationship between curvature and focal length.


Explanation:

The focal length of a convex lens changes as the sides of the lens become less curved due to the relationship between curvature and focal length. When a convex lens is less curved, it becomes weaker in terms of bending light, resulting in a longer focal length.


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